Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a31919ca1a2a38…

MALICIOUS

PDF

95.8 KB Created: 2021-09-03 02:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7414e30dfe74a30680b2254d8f20516e SHA-1: 8442f6e4a9d5d0ea919a8ae436edc236c5878e03 SHA-256: 42a31919ca1a2a38a0a648ace447e4b62df63de5ad6e839e8a6a1c2049ae9929
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/06b40875fe431a65707e48165c39491d/logukedonowidijarod.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c37af0deed6---sufuzokezepifotelewivef.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f4a26f4a3---97971992509.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827ec5c0a4e---mijadaxumulajidutal.pdfIn PDF document text
    • http://cabini.it/userfiles/files/4541120594.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/latiwukesijifid.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/jozopajojos.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/46f530ae17a2d74d8d4fbb83e61df6cc/11998484863.pdfIn PDF document text
    • https://parc-hotel.info/file/vexewodexukuwune.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/vemunewitajamabovimixikos.pdfIn PDF document text
    • http://maksimetall.ru/files/43627501338.pdfIn PDF document text
    • https://tl-systems.hu/files/files/47761907074.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/kurujixegore.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b8a469953---lunukuvazuxelakavinilezo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091015c7a9b1---lobakezuxunudubopuniva.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed230d0e90---tufamorelideworawafa.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/99339499266.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/ponazupebogeb.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/40ccd7cd904f09bd136418a739b204f3/zowaluwigibobaxep.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/67231685284.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ecf56a0eb---galukakarotinapon.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3538c751eca01b98c9378651c28774f5/tipowixawozaw.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/ab798de335e21d0384d8abc87f87ddc3/88024830477.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/tanoxolasulisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=partituras+para+flauta+traversa+pdfPDF 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_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 20456 bytes
SHA-256: b5e837e3a26bd933a8353eed97370fe588c76a4865a7b1ba897275f1837b2065
font_01_sfnt_off0001416f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416F 10432 bytes
SHA-256: 8fa224943f8556947b13ecb274553ce2947640dd0605109bc5e5cb5f76e92f84
font_02_sfnt_off0001593f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1593F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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