PDF malware analysis — malicious · 1b6732cb7fe43b0a

MALICIOUS

PDF

89.1 KB Created: 2021-07-03 03:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a8139405b5698a785fe75ac4a11751a4 SHA-1: 55aef087c5ca178fcc7d054b7ce88d7a08155641 SHA-256: 1b6732cb7fe43b0aa1294176139df1622f8997c54d0852c7abbb87e2b24db9ef

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host PDF files. One of these links points directly to an IP address, suggesting an attempt to obscure the final destination. The primary purpose appears to be redirecting users to malicious content hosted on these compromised sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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
Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL

PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
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://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dk47eak9aunpq92rgl60b9ka80/34212332840.pdf In PDF document text
- http://brooklynsmokeshops.com/admin/images/file/xejozoxe.pdfIn PDF document text
- https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ba944e00f---lewivibageg.pdfIn PDF document text
- https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/ce76c7e879ec1eca48fad32545462982/67450385170.pdfIn PDF document text
- http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a32636d4a4---9547099501.pdfIn PDF document text
- https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fps0m6f4o4gv9521h8ghbtrtm4/38167617806.pdfIn PDF document text
- https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cca0da7a018---66094253868.pdfIn PDF document text
- https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/q5op6retjkungjlu33vl9v56b0/lesagixenununitalotupa.pdfIn PDF document text
- http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acddd14af8a---ludivimuxobekojebesamo.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/k1ddav1qhmtuol3mf4g70umip9/40387320837.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/1eon447rjt43ovkehehvt9f4p9/moziso.pdfIn PDF document text
- https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1f7e7b0d06eb112d593cf1dcb02385e7/95841779924.pdfIn PDF document text
- http://karunb.com/UpLoads/files/kufavitoxadameketut.pdfIn PDF document text
- http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854d8340808---77138163997.pdfIn PDF document text
- https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ufe0o3kkh340o6birq3c6pcqg5/satadexaxa.pdfIn PDF document text
- http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160d22d94f3e8b---90749541353.pdfPDF link annotation
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b6e1dbf0---108994630.pdfIn PDF document text
- https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da8a9c94c5---sowimixofemelo.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbfc11c698---jawilogev.pdfIn PDF document text
- https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e76bfb1908d09e101af4a9ef6bb2f393/8679537630.pdfIn PDF document text
- https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae757a14e8b---58064233467.pdfIn PDF document text
- http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1d220d263---mefarulefis.pdfIn PDF document text
- http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc27554b72---dilivufafixuvem.pdfIn PDF document text
- https://protectname.xyz/whoisprivacy/userfiles/files/28123025316.pdfIn PDF document text
- https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609994d5737d9---xodimodinel.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pros+of+protectionismPDF 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_off0000f91f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF91F	10436 bytes
SHA-256: `eca63f20e80e2b99cfe7df8ca1470d7202e537eaf39601f4b19181d9b1dc06e6`
`font_01_sfnt_off000110c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110C5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000128d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128D7	17852 bytes
SHA-256: `0f3696ea2db253eb5c55a3f5431d12356e2cc2c5c6db28a692c9ac6dc89da484`

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