Malicious PDF — malware analysis report

Static analysis result for SHA-256 569907c0b240b9f6…

MALICIOUS

PDF

108.6 KB Created: 2021-06-28 06:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f292d41dc37e390902db443f608967d3 SHA-1: 55486079628b2719297ad206a876a8a723d027d8 SHA-256: 569907c0b240b9f66136432cf9970a5086d62f26d4f9b36334373e0519e0001c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of ML and ClamAV detections, along with heuristics indicating compromised CMS uploads and link farms, strongly suggests malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://krisoc.ru/uplcv?utm_term=osho+books+in+english+pdf+free+download PDF link annotation
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/45728849826.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/os6an8pbisgb2hsppcmm8phu8a/15646969925.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/89982201515.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/luxufujixu.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/dofetaxod.pdfIn PDF document text
    • http://esistore.be/userfiles/file/73798125927.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/furuwaduwifi.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/16136073477.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607882e525bf4---97031207580.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/39713955661.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zewovubofubikerewe.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f9d51762e355806bb5428e5a830f86c9/97723638583.pdfIn PDF document text
    • https://europartner2.pl/uploads/78237573326.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/94954997630.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/zugaxobax.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a0318bd7---28511344417.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/532a87287230afb1608d9247e0239c9f/xidifobon.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/rorageganuzofewosikajujif.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072560f6e02c---tejupudator.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/85e2j48sp57mlelfj77b6mqg0e/kokonewutelamunejiwuvub.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082109eb8e29---xupomesaminimazo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082a23037b23---kolulunelawesegomole.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070135334fdf---lelatonarewalunigu.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160878d2a285be---1682778572.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6eecdab4c866ba1a9179f3d7fa265df/48924357958.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001560d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1560D 20396 bytes
SHA-256: 4ec4ffa2046721e932949525bcc6fee6771aac78b4d6fbf3744327bd33971bbd
font_00_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 11020 bytes
SHA-256: 4516d0afc779b6648eb57786e72a0f51916802df4ce3299e262096ec97255511
font_01_sfnt_off00013dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000178ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178CE 16744 bytes
SHA-256: d37cf6576cad0e91ad2295eabcacbb0455b4c64ed9cea173ae0961388e5ebe58

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