Malicious PDF — malware analysis report

Static analysis result for SHA-256 0507d019b2f4e597…

MALICIOUS

PDF

90.3 KB Created: 2021-07-08 01:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ba1c03525d9017cb02df8bbc9ad887e8 SHA-1: 5ba35ed7175e3f8e840c00867ba8c34321637343 SHA-256: 0507d019b2f4e59701724a84726c73fcef906cea352db630c4cc8fe426320e9b
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=basketball+bros+unblocked PDF link annotation
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1af8237a1---futogilatoz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/qupufeori38rd0r8fi4g5eqfuc/nekiderokereburan.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b825fe6---kakuzikuzuwoxupemafumu.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/32c0ed9551090dafcf31bb946eeaf5c1/33919592455.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/4a29e1b5e62ac2bb7718643c0f42152b/xefilesosujesotexogejibax.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/fevipetizopukosusipalez.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f21b523a94---58418621316.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b44616da---leludeti.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/18718481157.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a95292317b0---94587616788.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/torug.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/79d816cb2d71da9d56f1fbe761acc2a1/rijogi.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e50d0c0780a---82504447650.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/227343885a78c200660ff7ca4341524e/90987239694.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e050a878d---20098795683.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3282a5f4---kufozoxezisemabugo.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/fofopigenudidamimeb.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087664699ea1---42952259411.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798b0ef2f68---23211421117.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/goxilarepegapuvan.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/b15d68bd8300c2d99d0eb9cf7922db5a/58370767604.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/sojoxe.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16085230a270a1---zaxajasona.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_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 10656 bytes
SHA-256: 49840c112d998f3546303fed2a0be4ac5ef63971a6daafbb404f1b006d1b0038
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 17496 bytes
SHA-256: c8dd53501e5cb918cb8438ae1f17437471e464831d6d8b75a778069f16e43026