Malicious PDF — malware analysis report

Static analysis result for SHA-256 b821115a1a851932…

MALICIOUS

PDF

72.0 KB Created: 2021-10-07 22:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2c4af40f97784a2874ed72c143eef496 SHA-1: ace53ad31000f3e4f388b95e415ef23941e98181 SHA-256: b821115a1a851932f8cc102f631aa8d4a0d7fc8b0974d4921dbade9ee38bf74d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns align with common tactics for distributing malicious payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://scalping.ir/data/files/file/4292215290.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161423352cb917---23070046870.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/jemuva.pdfIn PDF document text
    • https://glozorcom.merlak.ru/userfiles/file/90252266508.pdfIn PDF document text
    • http://ijfbn.com/editor_up/xijek.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/91397164629.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/47234619968.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/56ce3bae259ca7942c9c56f0885c3140/68588026186.pdfIn PDF document text
    • http://delifarm.com/images/file/93876648539.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/18656150786.pdfIn PDF document text
    • http://fxmeat.com/upload/file/350c5c1d683426a07f53c1d80a68e988.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/99779943448.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/65900673497.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/49273788704.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/zafewuzonirupug.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/56694497547.pdfIn PDF document text
    • https://bdata.vn/upload/files/77275145133.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/rebixujesobazamuziga.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/06f43a7b8bcd51a948d34480d47c61b6/kitibimapigejorinu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613109852b180---zokukib.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/gobexerezilawilisokogarap.pdfIn PDF document text
    • https://brs.jo/userfiles/files/nodikoram.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/66447923739.pdfIn PDF document text
    • http://farmina.ru/uploads/files/lotaniperovasunipexapase.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/45078911264.pdfIn PDF document text
    • https://il-gusto.com/images/file/70783964156.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zatebezupunolobev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=imm+5444+form+downloadPDF 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_off0000ba6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6D 10276 bytes
SHA-256: f2810bec051cb2df31fcd3f78630049dd2aed7836ed4816b8b8ed3fa3be2ca09
font_01_sfnt_off0000d198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 15940 bytes
SHA-256: 1cef89acd041f31e23faab50078c407d76813abae3bf746c7a4382d04086d4c9

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