Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c3987cf372c969…

MALICIOUS

PDF

75.2 KB Created: 2021-07-04 16:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8922a9be618496a6d7255efea62bbe6c SHA-1: c2a13aed9d91a806cfc1a7364441c17692dc0577 SHA-256: 39c3987cf372c969b22b020c19630957097e0a80d8402bcb829f2daa82b4b719
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cd222496162f0bc2f342dc348d128e30/gobososagugiluvufu.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b52eeb8d45a8ce3a56eaab6bbd1261fd/30760044109.pdfIn PDF document text
    • https://cooperspick.com/files/16900174897.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/bidasufam.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ac45baf1---bapedurorima.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/b5f9a3a34db409fc33826aac5759f218/61886954045.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63ffaf35d---lazokatizimasi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7ef0bab8---mizekawamofaxez.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3f048e633fdeba81adde307ad4b6afee/79821190389.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/3b36uk3a4atgr6e101rs84lifh/tagiwi.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210629_214908.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/vivabavuz.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/fg93ka8adbb9ongcs73d8cmt56/jurivaperitowogefulupivi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/78085698039.pdfIn PDF document text
    • https://watertorens.nluserfiles/file/42926969277.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7eabf88dc9cb501dceea859109d7070a/62545898917.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/76612895270.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/artm52va3ulj92pqlonel6oajj/26538823034.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mqmk5g1be1peo4f0alfjq7euh3/xosamilagawozekepebidadez.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/s2kmdneiu0us3khfvhrri8sl5n/jikafametonilojijoba.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210620/210620042010443444vyaxa8o5ke5l.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/16637065645.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/82909124825.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=why+study+us+historyPDF 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_off0000c5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 16056 bytes
SHA-256: d3b515403af6be20363cc5c56682bf11ce1352bd4dd367bbf083a2ee14b13313
font_02_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 10108 bytes
SHA-256: 4253877b8eb48670d1dd3d36854ad5760a845f02491c24b5d81407d5c797c0ca

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