Malicious PDF — malware analysis report

Static analysis result for SHA-256 db27fef4e88a94e5…

MALICIOUS

PDF

89.7 KB Created: 2021-06-30 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8494dad16159bd45c2e06ba1dcdeee39 SHA-1: dad407fb398462b21fa48332833c15cd00982ec6 SHA-256: db27fef4e88a94e5c4cfa8a94dfebbd225fb8abb894c38c4d19b828808c1ae6e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external resources, many of which point to compromised WordPress upload directories or disposable hosting, suggesting an attempt to distribute malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. Although no scripts were explicitly extracted, the nature of the URLs and the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/dudefumubaturifixe.pdf In PDF document text
    • http://jrmhandling.nl/upload/file/valumofalulutijo.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb036a3f41---53764451796.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/rosaxorukabudizosidi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c13f727bdb---38407828570.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38f1cb234---20838047993.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d4bda3cd---55280370457.pdfIn PDF document text
    • http://donelreunion.com/clients/5/59/59051ae02fa593b10ab13f41bf6316a1/File/mivibudosowum.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3eada03cf---velowonar.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/55396260547.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3780e503f---33441592171.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/supiwagiwi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f11027b4d3---91709454448.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/a25c395c4da4e728d0885d96066d74d6/97036311176.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/46113808211.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b619373162b---9305127338.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/jasomitumefokarazed.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aafd3b27af6---38406937137.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/bixixotagadok.pdfIn PDF document text
    • http://aqcons.vn/upload/files/gelanonuriselodorufil.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b925451c0---lopepolirab.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202106270614323988.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc790f8ed61---bevilaboridiw.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f3e7792e7f8a68fa7170da3b3d0e269c/fetiwipizuremoxezimome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=biology+investigatory+project+on+effect+of+antibiotics+on+microorganisms+pdfPDF link annotation
    • 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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 11468 bytes
SHA-256: cfa6ad189ca863c49922657d58ffd8b1f16900050a5300821e4139df5c0db252
font_02_sfnt_off00012b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B25 17432 bytes
SHA-256: 1bcfc2c4cf132db71419e35ced03c6813b75258f7ce4cbd5f7551ed960fce053

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