Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f14710b80887d61…

MALICIOUS

PDF

75.3 KB Created: 2021-08-28 10:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 43591e9c331dcf7391ea8d1d87ca901d SHA-1: a6f68ad4ee50c2364d6ff0b0db2c45e900c1d484 SHA-256: 4f14710b80887d61c568d5b38758030890fe2adb47b6b3bf87eb8392abd78aa9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The PDF's structure and embedded links suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://inwebjor.ru/uplcv?utm_term=puffin+browser+online PDF link annotation
    • http://marta-galan.com/files/varios/file/96839894534.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021081019542373499.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128255ade75a---runuzusomofavorukisur.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/lediritorubibevoxi.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/95563634656.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/6fbefc84e9810dc1aaec965d7a12939b/dibevojutinimaxevena.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf61561b87---xokepesedivoforobasu.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/80628290837.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/73521361358.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7d87d6ef---vedewuluj.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/misulobebuf.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/pefodaminowafejevijo.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/35185843190.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///364254570.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6f673435fc2b55fbcaf9c04a5aee7d40/wajuda.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a58e1807fc4defb3ee9aac5e12753304/1185969542.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/42584aff12c0d582ab5f6011601fabcc/joveboditiketosema.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcf7c66f2e---xuwipanuvanukutiremara.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f43c73b941351f4d4378199ea6ffc122/fofuvuvekebu.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/zufafo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8pju7ausvtau8c0bg8h6vop3u1/53386647751.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a98313d87e2---76362062949.pdfIn PDF document text
    • https://eucolait.eu/userfiles/files/84504854443.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/ranoxep.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_off0000c57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 16520 bytes
SHA-256: 1149edc55d2daf17e0b13c75c7a1584b515327153ca8a1a9d79f8656f0744bd9
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10276 bytes
SHA-256: ae9d81d018574533c13e637d4b0294a81230835998af2469f234b003b9ee0a96

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