PDF malware analysis — malicious · cdf1c3c768c7f5fd

MALICIOUS

PDF

90.5 KB Created: 2021-07-20 10:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20

MD5: 79ab4c8faf433b6e09fabb16c8db3550 SHA-1: 5efb289aab354a2eaa89b9b5e9bd6f6f8dc33c47 SHA-256: cdf1c3c768c7f5fd61a1ad03145400273bfdc4b406db41b8ed3f5f40f2aa44ef

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9937

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://fiumaradelsossio.it/userfiles/files/7039888625.pdf In PDF document text
- http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607221963fb7d---wexotokugizeropovinabe.pdfIn PDF document text
- https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/6626fc84285d688da9f18ad3c2ee787f/1422595338.pdfIn PDF document text
- http://ahkjt.com/upfile/file/gaziwe.pdfIn PDF document text
- https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcfc0f5fa---29815357809.pdfIn PDF document text
- http://stalmost.pl/userfiles/file/wokubamadazupepagesi.pdfIn PDF document text
- http://magnumprint.ru/upload/files/zodazejigozaladakoduva.pdfIn PDF document text
- http://brmhn.com/userfiles/file/20210611184236_g4207d.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de458c0ad2---38307569164.pdfIn PDF document text
- http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0f20032a---87985095998.pdfIn PDF document text
- http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608161f2d836f---13536554487.pdfIn PDF document text
- https://graveyards-fuj.ae/userfiles/files/42826964332.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/00433a62a558dac78715d17340cd2797/67317666854.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ddeb82f7---38398049168.pdfIn PDF document text
- http://minhledtran.com/luutru/files/ruguz.pdfIn PDF document text
- http://citescolairedeledit.com/include/file/85658810375.pdfIn PDF document text
- https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/32d5753ee869eb53e0dbbd1f5459e305/nudiwituxuzobo.pdfIn PDF document text
- http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/qmc24muc4i15re40gfra8p0s2s/jubugojenewodowenobakij.pdfIn PDF document text
- https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/54212515981.pdfIn PDF document text
- http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fpfn1p975vq3g5vjk2dobgmu0m/60755134849.pdfIn PDF document text
- https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/9835356d3bda11a0a9dbdfcf860b61d4/zawujekedeporefu.pdfIn PDF document text
- https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609c061d620d2---11841386731.pdfIn PDF document text
- http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609728858a3e5---gevigofofove.pdfIn PDF document text
- http://bogelaipigeon.com/upload/file/pokodufuparejuju.pdfIn PDF document text
- https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/70e0f34eb209b3701be2e8e3915d405b/pikuji.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=watch+boxing+livePDF 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_off0000ffa8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFFA8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000117bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117BF	10544 bytes
SHA-256: `60e2819780e935dde799bcc6f5bfa915d2731eda1ce78bddb2941e480bc2a663`
`font_02_sfnt_off00012fcb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12FCB	17276 bytes
SHA-256: `d444dc24d94771bddbae44effca8329df2de67fcfd0166158deecf918a28297d`

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