Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c44c027e1a29f7b…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 20:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c4825fac0bd2d6b164baf5743331982c SHA-1: 5fbbef3ae9abf39863b537f2fde1a0309497596e SHA-256: 7c44c027e1a29f7b3f3d112ab269e6643eb040af6b8dda1540d2ffbe1a035e01
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://bloomx.com/sites/all/sites/bloomx.com/files/22684016988.pdf In PDF document text
    • https://terminal.hr/userfiles/file/govudexigu.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b45b634820d67dbc7ab674d34ba18766/dogafozejuz.pdfIn PDF document text
    • https://masihpt2.com/contents/files/20484387237.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/97926529753.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/33506433739.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lizok.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210806_041411.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/foxetogotepalugevajiru.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/kixuramotevavunu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/ja7gv93233c6h1iomf8mk0g65i/81521950303.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ca0fe57af13171a26f83066acd789f08/99622146495.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115f19110178---joxebisu.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb60a13750d---vadobigewiwigemon.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1611a38c38e902---xawoxu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5b617140a664b73325176790bc76beb5/bilamaguzabuzajezajugova.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210726001821_ro6u1f.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609599ff18464---59202729446.pdfIn PDF document text
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/9ub1lsolv6k0183hiqstlcfvrf/73237504766.pdfIn PDF document text
    • http://esrafisek.com/images_upload/files/wogerizirijor.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/49563038697.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/99447603364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=multistage+amplifiers+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_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 17708 bytes
SHA-256: a74a41f7ce92a23c7a34df8476255e871b7437d7d6a19c517a0ddaa5b77375ba
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10712 bytes
SHA-256: 6a5c63c2dd19ef092b5a80ac98dc3bb418a05c6811cc49e36881f2e306a5a004
font_02_sfnt_off000119cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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