Malicious PDF — malware analysis report

Static analysis result for SHA-256 927b22cd8e64ae84…

MALICIOUS

PDF

85.1 KB Created: 2021-07-13 21:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4a3d8e2a22800b18dbd06d071a76c67 SHA-1: aff5a1eb8bd8fb3c52fb94dc4834a418ef180b2b SHA-256: 927b22cd8e64ae84a7d0227af8fb5b998bdf05ff2011524fa4917afcbd0532c9
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated high maliciousness. Heuristics identified it as a link farm hosted on compromised CMS upload storage, with many distinct hosts and UTM term redirectors. The embedded URLs likely lead to malicious content or phishing sites, indicating a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828fd13963---vukutogodix.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727c6ddc772---wojuwumogelan.pdf
    • https://planet-pvc.com/upload/files/85278825316.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ea425e038---29882421857.pdf
    • http://conhantaoankhanh.com/webroot/img/files/werabarugojike.pdf
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/42210097118.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16071b45959e59---giriteretujixelowaluje.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f6e8c36a7b79291c858a671cf265e093/84374016170.pdf
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/63a73b856db33cd246183e0c2cbd098a/mujoxuzibimavumolepaful.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b738e57e82---matojibuvadafitoragux.pdf
    • http://yljx.cn/images/upload/File/89751927080.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/46412624384.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160736c1e9b3fc---jibugijafaniwomefuduwu.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5492ef6ca---48058865369.pdf
    • http://curry-box-deluxe.de/userfiles/file/5390839066.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160862bfe32efb---17777126016.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c1320dd68---3811108323.pdf
    • http://hpworld.hu/data/pic/Image/file/4182650396.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd063d7deb---zepukurexixagesoxi.pdf
    • http://ghibms.com/userfiles/files/6718435264.pdf
    • https://aokman-drive.com/d/files/rakazidutewerizojavarilol.pdf
    • http://ms-krmelin.cz/app/webroot/files/files/wutowanojunawotaruwileg.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848cefefdea---vawemadizokejopiximago.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1b1b3972---lonorinuki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=laws+of+thermodynamics+worksheet
    • 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_off0000e705.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE705 16792 bytes
font_01_sfnt_off0000ff1c.bin
e3689e500bd5e7b81ec7fcf072bb43ad60964d585cc0ce9e4feb26bf9f6e82d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1C 10944 bytes
font_02_sfnt_off0001186a.bin
49a9d8f4ab5c4928754ed2ea7fc26c180c040a620b1bd1f6f3907b5588f82f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1186A 17644 bytes