Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cc350316a393e68…

MALICIOUS

PDF

85.5 KB Created: 2021-07-12 16:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1a9a35d35691bb88a7a01faccefdc693 SHA-1: afceb961333b262dba73253f0b6bf52a2b9c067f SHA-256: 5cc350316a393e6800826e2f341260413d5b35a2d00e00234fd947d89bfcb81e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://allytemp.ru/uplcv?utm_term=the+cattery+near+me
    • http://villa-carlshorst.de/sites/default/files/file/pupux.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086da73b4413---laravano.pdf
    • http://cafehinglung.com/uploads/files/nulilozapopasekagaravis.pdf
    • http://nensi.si/upload/file/83844518415.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q6q1i6kicl5gtsn7h0esp3qpan/digazusubonibobibuma.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc42a16ce6---tifaligojiwuxen.pdf
    • http://ahxxzx.com/userfiles/202105/file/44090377952.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/d26e8ffca11b29db0027e26547e54030/sivofajo.pdf
    • https://advantagelic.com/singhania/downloads/file/sebibodoseji.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/a463a3121c27f21d56c7fbfa919d4424/tamudokukebipuxudog.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/25e129e32ae1a06a87e9792aae41ce1d/17773171283.pdf
    • http://studiosimonepantaleo.it/userfiles/files/39596338596.pdf
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210611215001.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/iijjshqsi4i90rpv9j9bvsorm2/25864389093.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2a3f046b8c02961118d320cbcef3eadb/88161544197.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7822d58a85---zuzutafovavosa.pdf
    • http://seritour.com/rsm/files/fidukakevifokarubejazeref.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/cc0100bad08d8abf32611234b9c2ede3/xolanawezufofan.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h6a7jd89s025hknbehoipiinr2/mijomutatuvidobebutede.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ac64aab9b---35043574919.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/jivolukarusanuleje.pdf
    • 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_off0000eb63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB63 16792 bytes
font_01_sfnt_off0001037a.bin
6c1f6fa998a19b6b52831a9e4c461c33ce599634a47ff8a0d87ba8b7243962d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 10148 bytes
font_02_sfnt_off000119fa.bin
d7e0fe6ea603f1d976aa9814abee33a4d5cf64be72b715d07430ff66c5142fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 18020 bytes