Malicious PDF — malware analysis report

Static analysis result for SHA-256 694128de3a59faae…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 06:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5e555f8fb89d6f2e7bd7dc240e2b378 SHA-1: eb06b0eee512f2037206075c5b394c1da21b3f33 SHA-256: 694128de3a59faae945d8d6bf9991b224d8a069b93c148dd496ab6bda410d495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. The primary attack pattern appears to be a phishing lure disguised as a free book download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://philabc.ru/uplcv?utm_term=open+library+free+download+books PDF link annotation
    • https://akapacha.com/userfiles/file/73123094080.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/d56a710f61fcc85ddb190281c1728a26/mopimukebofidofusa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089724ad265d---56122038509.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/90446063356.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ipn1emml5ie3lvnit1p9ok82k/nipomiwivigikugekofo.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/95843470569.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/14510749511.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/lonajifolaxizu.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/getafuvuzekajaremex.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/83334542278.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/ginivubonumo.pdfIn PDF document text
    • http://sushibelovo.ru/files/zuluxoros.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae7a0f1729a94675268fe5e901700029/1066240190.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/d1ajok5s8i9qk5m3nhq5d0so5e/70285691425.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/xubarikebutezafosuzip.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b0783ab59---tibukijepoko.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/2426911262.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38ca3aeef0---lanebofekogujem.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nn194lkujl6rht72rdm22a7n81/20196557042.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/31850917625.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ab9d7b78---81807977769.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074149a03f81---rijewo.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/62998636969.pdfIn PDF document text
    • 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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 10852 bytes
SHA-256: f691a0784b91646edcc18e2545ca232eeeb2aa3337cf62dd377c0bce9a442e9e
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 17760 bytes
SHA-256: 3c7fd9168949a72539e3846fd55c3f03b1612c0430605538f36fb30c47caf48b
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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