Malicious PDF — malware analysis report

Static analysis result for SHA-256 288af6cc8b212c1b…

MALICIOUS

PDF

161.1 KB Created: 2021-08-06 16:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 181f8683153f96df044f19913eae6999 SHA-1: 971df1ef9a6f1658b5d0143db0b0289075e8ab68 SHA-256: 288af6cc8b212c1b0f71a97e3f8b6a688cb08c21e1e18dcc85196ead5f70c102
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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://huntic.ru/uplcv?utm_term=freddy+fazbear+pizza+location+near+me PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f96cc0d0f67---jibab.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3957251b20---19892061989.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/9729681308.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f9d7ba802dfb859eff5d9e67e8bc8527/zadejupotokifalaz.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/jefatosev.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/6758756301.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/40372459780.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/80049796290.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f77753395---24223637920.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/31625714429.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/wufemodokuti.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/60b34050e31c5d6b369a25737944a877/bepojejimoreferuvejax.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e91b49c271d53ec642387c2c543372ed/gakalukugineverugo.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/50708361673.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/lonabanexijizonuwada.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/fetiwamaweba.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/aaa8502bd2de00d0dcf4f054d537ae30/441947858.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/fumejumituxekokizukala.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5849ee4aad---56912277443.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/73160092235.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa0db85672---82589909262.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103031e2bc89---sibevegivop.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD28 18136 bytes
SHA-256: c32c3d66393ec168a982f7aae30a3699cb0882e86c9dda45e93f08a83af85091
font_01_sfnt_off00022d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002458f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2458F 10904 bytes
SHA-256: 57795b78642c490b54d66e4bb2278a11ce3cf7418e394d350782311c6f0149bd
font_03_sfnt_off00025e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E88 16484 bytes
SHA-256: 64794009602ac6320d6f342430cb293439fbf1283c26b0c70b0cabe2bef15953

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