Malicious PDF — malware analysis report

Static analysis result for SHA-256 279c48535aeae993…

MALICIOUS

PDF

92.5 KB Created: 2021-07-02 22:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a991dfe57bb204a3cd52a1d4b333e3f SHA-1: a18a7996fee273e61d633d35733c3d49f914c9d5 SHA-256: 279c48535aeae99352559889373407a07ecc2e5d42a0166fa642718f06ac783b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm hosted on disposable or compromised domains, with many distinct hosts and UTM parameters, suggesting a phishing or malware distribution campaign. The document body was unreadable, but the presence of numerous external URIs and the link farm heuristic strongly suggest the primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.520amis.com/upload/files/85409621585.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/f640de4613bcd0aa04b9f082f39e47e9/31727631901.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c99976f1---92308995354.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/54506028795.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/36375085131.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c93217720---widixetagetoxafivuler.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f5e70fd31d01c54eab862d3eddc8b66e/bobimelitidijupiso.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/eir0sd35p2845699909bej1dkg/74591202877.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609e07a668326---15491240245.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/zosokezotira.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/68853650063.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babae8ed894---dasulonebevirawepewizi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ln5g7fi7m5nik49ole8gclh0i8/88966090583.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb6b775c96---87837767362.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/45341604933.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2050b575---23519084935.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb3b9903de---wurizeduvuvapowusibagix.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/gr2l5b1l87vcbo5cini763n63d/lepizavedi.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/ronag.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fdd76503f8f8e743261779c1ce439def/fibatitu.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202106241015133283.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b78b4fc71---25756251419.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/b42b4d0bbeb6d4c4d5690ca2e4b52dae/43510466654.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5b3ffb8bd6d0bf261f1331e171e3437d/76027566730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=an+example+of+a+scientific+hypothesisPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 10844 bytes
SHA-256: e0b08409d38ef880034541734deea69cf094470ea11633a5ecf632612f561036
font_02_sfnt_off0001352d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352D 17452 bytes
SHA-256: a1ec0396a9ef716c2b9439fa0714b37e7cf0a256024c26ad6cb4dfbfde2c708d

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