Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c16f588edc48f5…

MALICIOUS

PDF

81.2 KB Created: 2021-07-05 02:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d87c10c24d7424c58d3670157205cf8 SHA-1: f6abf545ea33401d2842716a14d6af7554852d95 SHA-256: 44c16f588edc48f588718ee2cc7236b6db6e48aa4fd1de5296192e23f7f83c34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://anjingliar.com/contents//files/gedozawejode.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bfac3ff1e93---nufodi.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/5i494p3de2n87kdjrj4098fdm0/virowosu.pdf
    • http://capitolmetrophysicaltherapy.com/userfiles/file/ratovapezanusofulopov.pdf
    • http://maility.pl_adresuserfiles/file/bijesufokirikomov.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deb28251a7---dojetilediwo.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/8fb8c68f0457cc751b15753535154b83/27268082051.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb5ec80c58---95368179270.pdf
    • https://tailormade-sales-marketing.com/userfiles/file/wetijatavopiwepixul.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607043b70cf22---gapino.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ddbbc8b8009a27b94439bf99e5d1b769/55905460136.pdf
    • http://wolfpackbasketballacademy.com/content_docs/85876524700.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/cvu9mctm5fuc5k4qu1e2q8tu0j/nefajazeludeb.pdf
    • https://diarch.in/WYSIWYGImage/file/zanikubevefifumazutosi.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160805a68aafa6---80594941809.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fb2197bd9---3063666642.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/96914095941.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607975ac19238---69790080739.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3f6c3c405d924eac30fac0bd6af13aae/4424477221.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907c91195c6---tolosuvadizole.pdf
    • https://paklya.su/design/img/upload/file/12188586430.pdf
    • http://artecgroupservices.com/imagenes/file/83815055635.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d5156f02---24887400945.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=common+snake+necked+turtle
    • 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_off0000dbe2.bin
380acd724b347916c1ea6b806f70a4ac0f56ac105458406b1cacb0f94284e963
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 16696 bytes
font_01_sfnt_off00010763.bin
fe5a2b3967802d707cc21a3f36526047a9fea45abba20ed1057ec0b2e1719653
pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 10664 bytes
font_02_sfnt_off00011fda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDA 16792 bytes