Malicious PDF — malware analysis report

Static analysis result for SHA-256 736697d569c462d2…

MALICIOUS

PDF

89.8 KB Created: 2021-06-28 10:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d364ceda69730ed430ae5a0fe1d3adc6 SHA-1: f36bfbe070cff219260c5934521e07901e734b05 SHA-256: 736697d569c462d28f191114ee14845dfc5300c8ee32d7ed5cb85457af1025e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were extracted, the structure and numerous external links strongly imply the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=cabot+library+harvard
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/6062e4269ed50c85e65497a06cd0147e/peranudubokozasekuju.pdf
    • http://dlikefulproductions.com/clients/875850/File/wevekuvoxo.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a27c9396bb---gazawuri.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/f5b2b30890ddfabfafcd7acd549c13e3/lediba.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d56683588e---dutofopifinidirad.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c47bc1af230---70419697660.pdf
    • https://vinniescustoms.com/userfiles/files/81953472223.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a585458a61---43062040551.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf81c1aced7---8537634960.pdf
    • https://plasy.com/uploads/file/tamavefixemikufujumenapiw.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0a512f892---90993106152.pdf
    • http://softwarefactory.nl/images/file/49874100448.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/nqggkbvcljd9mn097ncrlc7ji6/wudomafexirozokuvutalux.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f7260e8b419299e0d83020f12867789f/65544018194.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16097740f2bdbf---nalekagetugisovamu.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/535c4018e3c3680577042bbd465844c7/97179339570.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083523e52f90---42665845914.pdf
    • https://baohohoanglong.com/userfiles/file/34027994350.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9ae6d60bc25496c6a81feb8478fdf75b/57857687827.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/32422835838.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9becb029---1975287496.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9ec5b19f---27327613678.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5db05939---purefudinul.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/e99cf87acc8f976134a3ffe5edcf931e/56342671930.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606fec4997d74---37157126056.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_off0000fd63.bin
0e25ad5f21fad8fa76e14e9589cf1eafab71560689e776eaecf86d8c64972636
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD63 17300 bytes
font_01_sfnt_off00012abd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 16792 bytes
font_02_sfnt_off000142d4.bin
6bb0295501a099711da773848335200cae3e657b8244dd5a364bbce1a18d2d23
pdf-font-stream PDF embedded font (sfnt) at offset 0x142D4 10292 bytes