Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4635c8788ae47f…

MALICIOUS

PDF

90.0 KB Created: 2021-06-27 02:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce96f13cec0f1adc40c9ec8f41cb17dd SHA-1: f99771f1c0290b8cb768f4cb032a6187736e8123 SHA-256: da4635c8788ae47fd3a69f82c42012f922474eb8006059674bb078e4d2ed4752
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, likely to lure users into clicking malicious links. The presence of multiple external URIs and link farms on disposable hosting suggests a campaign to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=different+types+of+seizure+disorders PDF link annotation
    • https://gulceoyunlar.com/calisma2/files/uploads/makezezeda.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/8h5s9eqeb2km5nah6ke6km0bf1/14414015362.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3719496b4d6c55f09d59f7fe86e638f8/fazikosusijinepizowalixo.pdfIn PDF document text
    • https://shopabrang.com/images/files/2855524801.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65473259e4---giduripelepapip.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1ec2f3c8b---60927376829.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/16369354589.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/rijuzazumisomadodonasul.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/dd477ba47638c0e9ef8c8c3be01c8e36/lejavenav.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/40089008412.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c8ef79454---25353469186.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1b8971cd---xoxiwidazakem.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3b7843467c354f92cfa6081bfe04b7e6/8297194255.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607333422e206---sogexepubemugegodi.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/limurutesibuledufotebalov.pdfIn PDF document text
    • https://dm288.com/slicice/file/kadezegilozekozuxon.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/8b2fb314f6b7395b04a76641ba374fe6/66522371363.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1c2d4dbe5cea0f9a4ada7514349d23ea/48927815187.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/silagibupinupawijuteleda.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/iuck9cp009smioiq218irg53r6/lunuxegerozisawilikilu.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b44bc5ccb---23010195944.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4tff1dma1if61pafdv2ni9kl3e/97167323862.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/mofurevuragigoxepodowobi.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e94d1e1c6---melekevaruduxulovizaj.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e33f14319---kuxivitufer.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/27290393168.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c350e93f745---jivajuvogegorijovufafozu.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.

FilenameKindSourceSize
font_00_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16868 bytes
SHA-256: 088eae26fd0a0133f4d2091443bd03ffd91168881977566d11ad8f78ce504c11
font_01_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001407c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1407C 10560 bytes
SHA-256: 9fad83923cb31a58b7f822ef01d1fbecc5f142fbc0a62cb515757565186bdb31

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