Malicious PDF — malware analysis report

Static analysis result for SHA-256 59881372dd583e61…

MALICIOUS

PDF

108.3 KB Created: 2021-06-25 23:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b0719d5f885cf8279a978c90760b90c SHA-1: 24a903f96a7543364e33a264d70d2e794ceb3b98 SHA-256: 59881372dd583e613ca289d3a4db01daba679be9504ab69715088a1f27d5446e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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 http://boeschfamilytravels.com/clients/43210/File/82665578329.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/cfd60dde8b6e5ac29158a9438a5b04f6/tubebituxapew.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d94a58dc---54157410443.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/57d3e8416ad1492241daaa67b91844cd/ragopu.pdf
    • http://asbufestival.com/uploads/FCK_files/file/1342648443.pdf
    • http://woodsfamilypride.org/clients/2/2c/2c83419adcf4927d74d3defe18342386/File/detazitu.pdf
    • http://hayatteknoloji.com/webimage/file/lazevutovewifumobetabopuj.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/11fe876a70040f87005933c06a8046a3/97367049872.pdf
    • https://jodhpurtravels.com/nbloom/fckuploads/file/zifudunaroxamekuroke.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a6b9b369f---36599450343.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607659335f6ef---kezusomivujemobuviken.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c64aed461c0---loximarika.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb61751678---54849897408.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a86ca7ebcaa---pegevowuwozimedutexijad.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/i2a50725q2q6jmka8fjjdn53uv/gedoganomiwijego.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0fdd7fb0f---50683147531.pdf
    • https://my-natural-style.net/upload/files/peluwezazegomeji.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4ee1265f73fe9a694d6e2d8618bfdb84/12429049692.pdf
    • https://mszukam.pl/dat//file/10463844892.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/metokimizumokufop.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607181f7c2765---dipasatew.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/21dc76b958b47c355b9a39c4c15e0fe9/dojorefej.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2d0adfa2---vajok.pdf
    • http://aimic.com/userfiles/file/5873131658.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/eb9f4223a749bf0c1d0915fce338ba49/5307062980.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=kind+of+germs
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012652.bin
0372a53fe33c96aa208d0aa9ce3582c6b28a1610cea5b18ab08ad7bfae677a5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 18708 bytes
font_01_sfnt_off0001570f.bin
c8c6caedcc2e05c1e6b087590e915df243a1635cb2e7371e97efd6284f55235f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1570F 10380 bytes
font_02_sfnt_off00016e42.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E42 16792 bytes
font_03_sfnt_off00018653.bin
a5962981187509496acb664ec930c7e32896ee7da7ee472b34e1adcaea0492e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x18653 18324 bytes