Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f889e7c5f622135…

MALICIOUS

PDF

123.4 KB Created: 2021-06-15 22:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 84f44b6a142f8753c29be0cd21797dbc SHA-1: 4bbee2f835242068337eedc99d52cf9f10adcda6 SHA-256: 5f889e7c5f622135f5980fef4cfcb3a9bd2eba5a958086e6e27070d7b2c4f7be
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=gta+5+for+psp+rar PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/or57cao8suonlkvd3ha51ial26/57194016534.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/74260457173.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/4cf0d24a64f7dec3dd39f583a63a50aa/xatogafifozuzegi.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/94457d8eccbc7ad1f1f6be67a81cf179/67607169299.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/1ede048d04b5b295594e5f5d0113b7ef/3737176419.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fikajepo.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/fd2417612842a0d4b2d5356965e00077/sifobufijawuwonoso.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/q0723v7cs42idj7ko01689u90n/74232344521.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/43544712754.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e71620bc8b---nigufeduzum.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/40755142694.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7cada806f4bc40c0788ac7e1ad9634b8/40241586912.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2ee66cf5c627d2ec993cf38edc6a4cc8/89545024903.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/59096848901.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7d98756a---8616068194.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001affe.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AFFE 25740 bytes
SHA-256: cb73d798ac0954a52c46b1ebce1ab723318097603be2b9fc1ab71b07b3341c5c
font_00_sfnt_off00013bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 11976 bytes
SHA-256: 10126ea051e57c259e7fe53321baa191dbce2d7d888c0cd48837551f02d83e1d
font_01_sfnt_off000162dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162DC 5020 bytes
SHA-256: a0516f0a533f10b7a093fa533dd516a0e4d60aff8677289f487caf9e5176ada3
font_02_sfnt_off000173fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FC 2108 bytes
SHA-256: 1d739be46a300e0470098b03cb3525ce218fda25c712b9663aaff7a7ecef4354
font_03_sfnt_off00017dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCA 18328 bytes
SHA-256: 5b8f0a8c42ea66c10403b9c81ba33c7b9b8813da8094257e9f3ed961a606c742

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