Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85decd2a5e86cb4…

MALICIOUS

PDF

81.0 KB Created: 2021-06-28 19:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c5cea5ac8a5f3f4b1bfb616ae06d3d0b SHA-1: a9e216f9df78b9acc3b36dcfd978361ed7139293 SHA-256: c85decd2a5e86cb42d5d846def538d877c07b1865e21bf463935fc824d611644
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document functions as a link farm, containing numerous URLs that point to compromised WordPress installations, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to external sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1ae9ac12---19561902629.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2294d8139---mamisexujijajesipebap.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11bc855b05---wepoj.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/er1l21gvvi7jh3t2she9rr2hd4/wazusutebesonevefavazo.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/707e445e7c68eabe7d4c7466da515f4a/78495777097.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/budawurugasu.pdfIn PDF document text
    • https://iword.de/userfiles/file/3863770285.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/viwejudetodiguvuwexig.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dd5abbcb4d035d067e6c4649154263dc/20707935642.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ed9e6e93538a62c0b77d7c8caa99ae10/tepezavejinetewuj.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/pelezegazowesabeteberato.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f36a5f765---fesizatewezikememoronulo.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5c8b42ee3---dapekik.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/fa2384974a3ee8677549b56bc164f042/46631789420.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/zenot.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715e8202d6a---lonujuwubamaxunobosidur.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/xibapewotij.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/67be7cbbba2dde8b553ef417b7d9d8e3/19962858249.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160756979e3990---8029661945.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9589c574d572d4353961e1bda93b7813/51832480305.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/2760789465.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/4859350794.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c00fed2fb164021f92486bf249eedc8e/verarokavomim.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/68771014223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tonight+i+need+your+body+tonight+you+got+my+timePDF 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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A0 17300 bytes
SHA-256: 6b5a2f91b83d08f6ac4e1ec8c6cef3585195e9884825c8abc5881e65d64f16cb
font_02_sfnt_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 10636 bytes
SHA-256: 9920479652dd862184ca8e9d8f8946fe4530e45f85b446c7a7c3322662717dd0