Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f821d783b8af71a…

MALICIOUS

PDF

86.0 KB Created: 2021-08-17 04:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 845ae75d0770a0fa03b248c21f171e08 SHA-1: 6797064f945a0f98b45c90920034f0b56909d050 SHA-256: 6f821d783b8af71af60c46fb6dfeedd3148b039458a7995785d3e15c6cedec93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress uploads and disposable hosting. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0ca02cb89---46858244589.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ab08f4g757643eo3vflt72v8p3/47963285096.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/60e2e3df601dc86c888b5086ae866b3d/1460708274.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/segalodojasi.pdf
    • https://bdaudit.ro/userfiles/file/zutimekoke.pdf
    • http://www.dean-cpa.com/files/adminpic/file/fubivukufixilevidobe.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/vig6k6od29uh9n479t92rfrv73/mozosisajesutofonisiru.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160744c3fdc5a4---9028466667.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074917c58583---tixarijilesazomodimuf.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4tpf6r01pr17b5l5nd94loks70/mavumezojolowules.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/efa8d2aba7b498693517f4445e10e5ca/bajovejamogif.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ad02f3c7e---59472806806.pdf
    • https://pcparts.fr/ckfinder/userfiles/files/jevijiwidapubasujavi.pdf
    • http://klinikoral.com/img/userfiles/files/13942400235.pdf
    • http://marinapogon.pl/upload/file/13478642032.pdf
    • https://przyklejki.pl/userfiles/guzovabow.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bdf99d43529---5007558376.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/s7o6u9ud2gjgm49jmlh0juofd3/1866720781.pdf
    • http://paneldeconsos.com/userfiles/file/bavumeroladepok.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/retumajoxuji.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/fd92f5d11078676412f1fb4bd2b8c866/tozozaweresodaj.pdf
    • http://alimentosldm.com/userfiles/file/fafivumipefufisa.pdf
    • http://thestarbusan.com/FileData/ckfinder/files/20210710_FFC2DDAA9774D07C.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=linking+words+for+essays+with+examples+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea4d.bin
b6748578023c765205c0b2ef4879f90b673c0ce6360a52f422941bd542e49410
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 11296 bytes
font_01_sfnt_off0001047e.bin
3a0846487f710b994bd8ee6dc48dc529ce87cf78230ba04d7b552071c66bc2f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047E 17208 bytes
font_02_sfnt_off00013127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13127 16792 bytes