Malicious PDF — malware analysis report

Static analysis result for SHA-256 57c5961c9c057542…

MALICIOUS

PDF

89.7 KB Created: 2021-06-30 16:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a00e4081c2372da505796031161f78c4 SHA-1: 71731765962f3999fa1225f549cd0f95fa6ec866 SHA-256: 57c5961c9c0575422896e3a00baca4de486f5d1d9a6cef91bc6841a69c6e1d1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF document exhibits characteristics of a phishing or malicious link distribution scheme, as indicated by multiple heuristics flagging it as a link farm on compromised or disposable hosting. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were extracted, the presence of numerous URLs, many pointing to WordPress uploads and potentially malicious domains, suggests the primary intent is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a248eec7627c174ee329c98bae94ec47/16738215395.pdf In PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216281511447410.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d500878d1---buzaru.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/cikpmlmpckcge80vn1m2oovnu5/jinerurinob.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9eb0d8b813---kulotilexubed.pdfIn PDF document text
    • https://daismene.it/file/rixurupilenoxewevoxul.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/pifali.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/jatazalabo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a2bb81b0---68035621197.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/310nakce1lu8vvibgk3e42avid/nufunerubaxezufaritip.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2162341f6---20996517401.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/4800ek5hrum8gibnom69dllfqg/murefinibanam.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/nigotobineset.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b60fe1a0f3f---97171034909.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/6511aff5e247ac7a7222ee8298b8a95c/vakuzi.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/97268698232.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a366c6ae103---barajodurukagafu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160846fa2cd8f1---58349159774.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb304086d38---62379937921.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/22193497128.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5754141ff---zafulujijume.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb626b520---gelade.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/b4c9aaabd90c1f314b15c29079bd47df/84278300661.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/9026a638cc51995bc4750b1b9b9fe20f/fegulesapupekufarobet.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b9802d51---55489314071.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad52d2a79c---30931197382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=princess+elizabeth+from+the+seven+deadly+sinsPDF 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_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11035 11120 bytes
SHA-256: a861d06a6e801cf71d39e146e5f52b56bf52732e7ad1ed9b7d302b52820320d7
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 17772 bytes
SHA-256: 19c972c5b6b7a110e913cc5c9addb46767f5f9f615d0ff433ed9e7c012618568