Malicious PDF — malware analysis report

Static analysis result for SHA-256 273a5b54cdf57ae4…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 23:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3ba57a9cd324772ee5983ee046d5b87e SHA-1: 041f9209952da63d3bd00b729a7285494e8917b9 SHA-256: 273a5b54cdf57ae4f3d586af4c576b06791f32f2dc3051583e7b019697c10eb2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URIs and the overall detection profile strongly suggest a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=how+to+delete+all+instagram+messages+at+once PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d3e3e0c065a5af24f36c8c35d687dbb1/49410474718.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8mmoumh54cvhbe0fl5i919hb47/85121043432.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e0c1dbb690372773dc0d7ebc0bdab0fa/99300962604.pdfIn PDF document text
    • http://allasclub.com/campannas/file/69396942404.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b6fecc3901863a70976123e82fc84f81/viwawuva.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2c2b1730c84ef9b4896f5513405d7e04/52865648379.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0dac1794f052f360f9bbb0c5a2993088/43633427208.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0275b5660---gasimagedodog.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8bd1daed03---64774724080.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd0aa5c29---xegudukanilumu.pdfIn PDF document text
    • http://funperm.ru/content/file/4957401686.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5ss8mnmrh63i6l1fd787l7a30c/46967786785.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/dna06q7rca0imldrj76879n949/85542625051.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/21665749481.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5045ec80b8---nezukijofadinotabizuroreg.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/binulumepewamirakapak.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c8fba4b6---89482779627.pdfIn PDF document text
    • http://temple.mo/userfiles/file/29071746681.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/25s0eiv5f10l0uhrteck98b1f0/vuxoxitenabonulawutipu.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/46401628780.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/rilatukotir.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sogexavepevukusujimusir.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/f35e443255e4947d93a42ead6be2b467/vinepujowugizisomejewor.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/rgc6p9bfsjvensqms4r85qg37a/netipikibunogaxipobuwedo.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/91491574630.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 16644 bytes
SHA-256: d3c7b17dcc149819c921d726bd51fb25b03da878fa2e0395a2a521dc51ac23b9
font_01_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 10788 bytes
SHA-256: 172dc7a522a5f18c46f80fbf211d0cf00b50cbf49675f16510ebf6686e5d12dc
font_02_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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