Malicious PDF — malware analysis report

Static analysis result for SHA-256 16257695546daa51…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 00:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24e17ffd1cee07fdbff3e41832fa568d SHA-1: c88f1226196ab25d55063195410f12ab6affecce SHA-256: 16257695546daa51c176aac8737c0eca0f9440392492b18c29de2e96d8e92926
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of numerous unknown URLs reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe6847828---33110685285.pdf In PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/dujazonazasunejodiborol.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f7005094c2ccaeb181a15e83a19b177f/lugipujotoje.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c41f0bfab8---rofumikawuwujot.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/dodulusapujiz.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/jurajuvejagepafe.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/18881447369.pdfIn PDF document text
    • https://ahha.az/userfiles/file/74154493051.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/9a81f9039bec72e6a41dc283171dd4f4/sadojovedego.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c101a95307c759fa28a3f185cf16dd7e/84578537165.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e8b609cbd---57345644640.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd847c1deef---17264248629.pdfIn PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/dagazugovepufegisuj.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/0lmlgncu8lvvtv0km37lg5bl40/damatekupeje.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/sabawigexopufagilenumi.pdfIn PDF document text
    • https://najarshi.com/basefile/najarshicom/files/debedizezaf.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/43380091701.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/nefamozebefagodadaju.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/1c5bf59089a2a035a4c5e0ebc5e0a8bd/lonagigiminopasutajizesu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f416c2ff6---61065653808.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/jofiwaxokolu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/18debb68399040182f7cad9282c80e64/21352468227.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/o8rfn0kk9kpb6083k2sh9toei0/10838051508.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/samurutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=manual+hellcat+for+salePDF 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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 17856 bytes
SHA-256: 4d7e0984ef7294f13c761f0ba5b45735cf89dd64befae5a988164d074ca08981
font_01_sfnt_off00010c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C86 10432 bytes
SHA-256: 6b8be41953c283eedac75c762b3783a76941cbbe5395846e0c445b8f4e881c72
font_02_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1