PDF malware analysis — malicious · d67994463068e97d

MALICIOUS

PDF

70.1 KB Created: 2021-09-30 10:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 256da5bf13c36241738badf8239f90fa SHA-1: d8cdeafa41c9135b3e99164294fa8dd376c537fa SHA-256: d67994463068e97d3d17cbc7aec19f14dd6085f91865cc0063df89220a3d807a

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users. The ML classifier and ClamAV detection further support its malicious nature, likely involving exploitation for client execution.

Machine Learning

Nyx PDF Classifier malicious score 0.9893

Heuristics 7

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://allytemp.ru/uplcv?utm_term=why+apps+are+not+updating+in+play+store PDF link annotation
- https://feniks9.ru/ckfinder/userfiles/files/1519183243.pdfIn PDF document text
- https://hophamthaibinh.com/upload/files/98771170664.pdfIn PDF document text
- https://livstyle.ro/home/livstyle/public_html/uploads/files/5733564080.pdfIn PDF document text
- https://ooo-kenk.ru/userfiles/file/65794424395.pdfIn PDF document text
- https://homecareangels.ca/files/files/files/sulefok.pdfIn PDF document text
- http://wuyioutdoor.com/userfiles/file/jiletatafokemarejogenuw.pdfIn PDF document text
- https://pelletier-tp.fr/ckfinder/userfiles/files/sufotevesiluwexeji.pdfIn PDF document text
- http://21cedu.com/pds/userfiles/files/33664751634.pdfIn PDF document text
- https://projetovm.com/uploads/files/76026340996.pdfIn PDF document text
- http://forglass.sk/userfiles/file/20100631443.pdfIn PDF document text
- http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/21350492229.pdfIn PDF document text
- http://ramenzoni.eu/userfiles/files/kalupimepitemumili.pdfIn PDF document text
- https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/kixuzitamiparagej.pdfIn PDF document text
- https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/24fnmqd2p59lv5nlcg4r62el3j/zajawizimirivolusasudadu.pdfIn PDF document text
- https://tktravelkorea.com/FileData/ckfinder/files/20210912_C5FBE6EE657FDF56.pdfIn PDF document text
- https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9c07363821cd96680c29c223b500095f/8011656297.pdfIn PDF document text
- http://zhymwz.com/upfile/file/79874113340.pdfIn PDF document text
- https://fiberglasssupplydepot.com/userfiles/file/7355982830.pdfIn PDF document text
- http://sedaciesupravy.sk/media/file/lipurizufunewidik.pdfIn PDF document text
- http://www.chubsorn.com/file/files/fesetomi.pdfIn PDF document text
- http://sadvita.lt/pav/file/loremar.pdfIn PDF document text
- https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/9up6meaf3ptv6s9h89t3e9b0bl/wizilibir.pdfIn PDF document text
- http://custom-mugs-factory.com/uploadfile/files/32743814871.pdfIn PDF document text
- http://terwaarde.be/ckfinder/userfiles/files/mozadurukuworixuwem.pdfIn PDF document text
- http://goddesshair.net/upload/users/files/duvomudodovenuleve.pdfIn PDF document text
- http://vietdubai.com/userfiles/file/nujipumelamuzuneje.pdfIn PDF document text
- 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_off0000b287.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB287	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000ca9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCA9E	10880 bytes
SHA-256: `b0e126d227adefa6697e8b0336ffa07a035e3420b893f3cfb0622db73f97d583`
`font_02_sfnt_off0000e383.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE383	15468 bytes
SHA-256: `38a57ffb588a3b97fec331bde1a4cb0b4a13a2a765a923b45e02ba916cd0f20d`

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