Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f5242ff37b96d1…

MALICIOUS

PDF

85.5 KB Created: 2021-07-03 20:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33b34a40bc4d141349be0843cf6d9169 SHA-1: d6a0482c6a582ac8b883482c7193fb15641437e7 SHA-256: 39f5242ff37b96d140949a97f02b1caaccf6bacc43dfb7af721c9f5983346fd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=everybody+wanna+steal+my+girl+download
    • http://lowdertraviscoats.com/clients/7/74/74ec8bd2877f4db8d0b9f56bae0111c3/File/kajurezupopajisimifok.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7nlmii67bqpsts534o8as4bb5/juzikudidipo.pdf
    • http://agendatourvietnam.com/hinhanh/file/ziperilu.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608879805e973---56953844984.pdf
    • https://mimpishiodua.com/contents//files/18156643026.pdf
    • https://fallsplat.se/file/lugobugakad.pdf
    • http://jr-bang.com/uploadfiles/20210622131516.pdf
    • https://intrigantka.ru/images/userfiles/file/71292957050.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098af30d0417---gizupaxepiz.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/lnjnpcckn30kquqf712fqm52fg/16881770294.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6rd3p4ghk2114aqm9iuv8jvc7a/mewemowuran.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726316438f9---45477217304.pdf
    • http://hongshengfish.com/uploadfiles/20210602/210602123820643710jvblzgoy1mgf.pdf
    • https://tomas-music.com/contents//files/84926004572.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e238c6309---65661842666.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/62818307707.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607de0dd66614---68998010455.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/123bf48899b3076e0d171192e144bb51/77637784104.pdf
    • http://pcwenhua.com/uploadimg/file/16228463061713186383.pdf
    • http://uci.ir/userfiles/file/mejifibozetisajajopebuja.pdf
    • https://akapacha.com/userfiles/file/furuli.pdf
    • http://brlairport.com/images/file/dokemefaj.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/5k4lvj3bmk7ovoag6dt94rv5u1/jesiwale.pdf
    • https://studiopros.com/userfiles/file/
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67380c51d---lodojujesudevoxesebugeb.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/e7ecd8eb00c98f378d89f1bba23a7c4c/toditevogudo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3F 16792 bytes
font_01_sfnt_off0000f451.bin
0c78e41477c875e51f77f75fe7cdf05fb36d352833abcee59cfc885bea443a20
pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 25184 bytes
font_02_sfnt_off00012d2f.bin
fd0b82eabaebdcf3e8bbbbcfb247e07abe2e03fc87757ee9f86a408008b4d128
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 10980 bytes