Malicious PDF — malware analysis report

Static analysis result for SHA-256 f84cd0d3e27940a8…

MALICIOUS

PDF

87.1 KB Created: 2021-07-14 00:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7c4904825d6d4d5f8b62b4e54ced5540 SHA-1: a8fb58f6f28d4fda86cde104ef45e97ecfd11462 SHA-256: f84cd0d3e27940a88feeeb59f7da4005074cd8e0cc3448e48a790c0cde330b85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics strongly indicate a malicious intent to lure users to external resources.

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.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a109ae064ed---tupigomudawavuviwipixes.pdf In PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7mnf5g9ad0e2uqe7pgihimok2i/kefufex.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608361e078931---46745015013.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071cec3433e8---viwizoluligijuzaxabitijo.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/2f66fde9ca978cfcfbe3b1c2d1633baf/71053741219.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/9593a4dd1c52d7e1b36ce44b70356cd2/40158015595.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c3fe1d4b8f332ea41bde2be61bb07384/78919632448.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/e037a47bf7ea7c997d21a6d36a60b0c0/tasosinanijajujosibobedaf.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13aabc7c2c---vusezigasuru.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc9678363c---69918869646.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/xabobef.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16217973301049.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/93993847185.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/gejevepezepu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076324555234---norixefuwij.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/11638489334.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/35672988894.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/40642986154.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083355cc13af---susozanito.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e9057dc0b---videtexinajo.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/80312772161.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5afdd927---lojilis.pdfIn PDF document text
    • https://arerp.kr/data/file///sewajuxazazolo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8515f90c9e---xusilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=video+player+all+format+pro+apkPDF 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_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 10564 bytes
SHA-256: fa57b6ebfe474cd04b16a1de8355938ab3c94815e8397ccd4da85c489b32e306
font_01_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 16760 bytes
SHA-256: a0a36e9465b322ab3fcaee7d4ac699037e951a84c72ca35c9299ac912d835806
font_02_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1