PDF malware analysis — malicious · f7b84935d0c6d8e9

MALICIOUS

PDF

90.2 KB Created: 2021-07-02 19:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 3f036bdb54bdbaf343e4f1df29f4679c SHA-1: e782ebe2041792c8392fe4e6d912122f78dbd943 SHA-256: f7b84935d0c6d8e920fb00ffb929fed22024751417e01cc9b71f3ff6115cadb9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, consistent with a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9835

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://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0663810e---1929229297.pdf In PDF document text
- http://01host.ru/userfiles/files/1554544363.pdfIn PDF document text
- https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a2d917a79---50546333113.pdfIn PDF document text
- http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1dmdinthvvka71ovn20rov4hin/taxowinix.pdfIn PDF document text
- http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074149a03f81---rijewo.pdfIn PDF document text
- http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc8b91a1bf---86213771821.pdfIn PDF document text
- https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076eea871220---74553963511.pdfIn PDF document text
- http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3855b990---wabujenuw.pdfIn PDF document text
- http://m2m2design.com/userfiles/94189409788.pdfIn PDF document text
- http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a972a26ee29---finomomixozi.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3941ecdb---68620895650.pdfIn PDF document text
- https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/nn8hbt6k7j01t4vasb2li1trd9/vepotezurejizupaxegukus.pdfIn PDF document text
- https://koratspring.com/upload/file/limopa.pdfIn PDF document text
- http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc89edd599---pitalexosokubipol.pdfIn PDF document text
- https://palcev.ru/userfiles/file/dazizozusaromubavibamup.pdfIn PDF document text
- https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d86fbca4c---55331125183.pdfIn PDF document text
- https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/74e1e8f36344d4417b8e9d193f4ba4c0/bapobetasinawef.pdfIn PDF document text
- http://spalovnachemolak.sk/userfiles/file/90728645898.pdfIn PDF document text
- http://maility.pl/_ADRESuserfiles/file/32704616327.pdfIn PDF document text
- https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a41d07a39ab9ee899fde549e9bec1e52/vetorawemisiri.pdfIn PDF document text
- http://archerelectricsupply.com/userfiles/file/52743712497.pdfIn PDF document text
- https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/536921f26dadcfbf55b52582fa111dab/2163802468.pdfIn PDF document text
- http://medi-sen.com/files/files/kimavitajikodoluguzigo.pdfIn PDF document text
- http://szyldkj.com/luodan/images/userfiles/file/jukataminofelakiwawini.pdfIn PDF document text
- https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bfd06a4e7---45496541639.pdfIn PDF document text
- https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/02bb99d739457773e8673e9419cf159f/nebivovupojododexu.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=dilation+and+curettage+instruments+and+their+usesPDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fc54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC54	17408 bytes
SHA-256: `1740ca01b2d1325bd4ead9fffc878948526ba13a9c33d1cfe861144408bc27fd`
`font_01_sfnt_off00012a35.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A35	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001424c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1424C	10920 bytes
SHA-256: `d322ae6e25ee218caa827fefd368cf7d743602e7068e523e906ba9de30e5501c`

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