Malicious PDF — malware analysis report

Static analysis result for SHA-256 f850cd32741eeb0c…

MALICIOUS

PDF

81.3 KB Created: 2021-09-03 13:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ebcbb1b81a3c567dbd21929f799e117 SHA-1: 3546f4fdc70edd1fe535faa649f241752c360beb SHA-256: f850cd32741eeb0c8cec8a06a4a445b565a7e566ac1f31de126a98d5fcd8a2cf
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7ae89654---22252944298.pdf In PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131be717796c---9003235912.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/zigemiwefibopa.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/91604800512.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/16211497671.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/437c772123deacdb7cfe5fd7d27de359/66199439980.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210608160329.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2subaiutcr9jdigshp31t7c5p2/5668804747.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965b230bce1---60303612573.pdfPDF link annotation
    • http://mlead.net/images/e/file/najasekitibufuxob.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160999ff90b883---ketija.pdfIn PDF document text
    • http://klhl.com/userfiles/file/73144900617.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/21192343729.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc65ccb3f5---kajege.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/59133602875.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/9582184292.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f960060e2---kizuv.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/92503889810.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/87b291976e2b0a95a5219d121635baa2/7311595653.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6nd1g0guvj24o38qs0p04i8p72/dazosa.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/wenodedebe.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/7967131478.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/vikefogojuxuluroximep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ielts+word+list+pdf+free+downloadPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24F 10528 bytes
SHA-256: 51c1757554520bb486899f11237350e127b4fc7429aeaaa2c4896c1bed3b3938
font_02_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 17684 bytes
SHA-256: 06e32f62544af33c324227d0b0236138597c3917b5de7827e79482d39b9e00cf