Malicious PDF — malware analysis report

Static analysis result for SHA-256 627b6e9c93525ec4…

MALICIOUS

PDF

91.2 KB Created: 2021-07-13 17:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0675fc0279dc29398c45e369ddcc0909 SHA-1: 72b7f47f7c1e92d9bda97c01cb6cd5da28b65973 SHA-256: 627b6e9c93525ec4491c407ee14d365fe9cf1d843d9564782042675f9a93c255
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm used for SEO manipulation or to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://wastran.ru/uplcv?utm_term=two+types+of+bipolar+junction+transistor PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jb2c0ss0pf15sftana4rn7rpl3/sajefefiwinitiz.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/tulivezakaza.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/77063508677.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8f40151f5637e14feceb172fac23939b/zedexifonajumelepevu.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/68889738584.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/pitiroz.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/6175034240.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a89b1719b---lesibovobaxozesen.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/488ef5cd8a1347e9f7a5950f9be56d4b/85022038444.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d24f94e19db---kaded.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/14755589262.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/12705454115.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/15876638277.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/sonimifeseketipidime.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1014546e0bdf458d17a72e711bd4e09c/70973838916.pdfIn PDF document text
    • https://topupdana.com/contents//files/44544364761.pdfIn PDF document text
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/jekozubozuxogexag.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e21f87c6f4a016951fb07d48eff828b7/zigamojibarinet.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/rumati.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3cdc3a8a4---fufedibupatufepidesuse.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607471ade755d---jutemarevedad.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28d84e6f43---sijamusananumilolerepasi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E8 17372 bytes
SHA-256: dac129dc13feac41aad67e0a4839ebfd28a39ce03c51da3c555dc2d6d7ca074c
font_02_sfnt_off000145cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CC 11008 bytes
SHA-256: b5fbd2635fdcbcf5f9ba39eb5be8cfc0822340c3ced75c47d93908001626eda9

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