Malicious PDF — malware analysis report

Static analysis result for SHA-256 39330906e829c709…

MALICIOUS

PDF

76.1 KB Created: 2021-09-05 17:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: aa8d7c5b70d9b9bbaa8ff56ba92a2b2b SHA-1: e1a4e17b2da501054b72214e75103d99f3e3b321 SHA-256: 39330906e829c70993965400dc11fa6c5b63dea0c0c8d91428ea96890ecdfd71
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of UTM parameters in one URL suggests an attempt to track user engagement with the lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://sl-light.ru/design/img/upload/file/wijivifid.pdf In PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae7ba0771---jojewewofusumoludisile.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/rejeziluze.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/514b754a0019bebbd47115c8e0bfd174/87385038976.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/kkigno6puoo80tbc5lni1ivj17/36574009887.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/5aefacd4f797ace99f61bbbf644364a8/nijimiposozokexigubepubew.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c84e93a1bc3---58407639086.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc6f7061e4---24256473874.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc22bb4a0dc---biwovixawugasafuwimag.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/xetanujupejepiv.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/vp7qr1ghcrqeuqnh3f1b32hbf0/xasitebifawe.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/gedodezevepuremi.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/22893248486.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/wozatepelama.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7bf7881d58f83280f72ea94229b4739f/begowiwemazuduwaraxene.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/11436470668.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/be65489784b80a1c9834aefc951e2414/21383077008.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160acabba2db06---pupixemudopagumidetejaxi.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/jolepunodazevem.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346c11bcade---27213418329.pdfIn PDF document text
    • http://keacg.com/upload/files/jimif.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/riord5dbauamljkpd4omsaj70h/60069382432.pdfIn PDF document text
    • https://unitytradecapital.com/ckfinder/userfiles/files/39894478709.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/57211425487.pdfIn PDF document text
    • https://subded.org/userfiles/file/98830163109.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/56f4b8e09e735b7ee15db8a6618281d1/53713954541.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=convert+pdf+to+word+same+formatPDF 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_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 10704 bytes
SHA-256: 6342e83a23d296415eb98fe2d45d461081fb8193ac5aa85b0bcfbf0e0551bb29
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 16784 bytes
SHA-256: 56238dcf099cc692d84011742a9eb23a1f47560cf2f88d70dcc5fb4d64333ea0
font_02_sfnt_off00010a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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