Malicious PDF — malware analysis report

Static analysis result for SHA-256 5968f5dc936854bd…

MALICIOUS

PDF

86.7 KB Created: 2021-07-02 01:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f11abb4840aa915441c4adc3962e3d8 SHA-1: c356a9ab67109950568923236ca04d3e411799c2 SHA-256: 5968f5dc936854bd3652b64a93d28a581e3964c61d8ae7b4d04efc9db71ea9b7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cambodiaangkorhomestay.com/userfiles/file/wokedidukowibagopaf.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d302e7b4---tosonomubaxukutijupan.pdf
    • http://china-hold.com/UploadFile/file/20210517162946085.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7549df74e---vaxikurelug.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/jekofapexetinitopegeratu.pdf
    • http://akademia-jedenastka.pl/zdjecia/fck/file/77916202319.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5682f1513---leved.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/516cfdf32f34b7c0545038894fd4299a/ferew.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0202184d206fdfa054af52571a0e5828/15940377440.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/3prde8nql62bafv2st62ub44c4/87309133322.pdf
    • http://billedbutikken.dk/articlefiles/file/58460670645.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hio0jua7ug75or3v1gogld12m3/36047348277.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/9f06227adda318d6112d1388ca5779f2/vinegavirotupijewi.pdf
    • http://www.allatpatikapecs.hu/images/file/22776967327.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778c96b7581---ginosabifuf.pdf
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e86a7a54---vapokeku.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad4eb24b38---nurewolimuxexowopugata.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2da46eeb522b0d07f4a865736bd3e23/nonalufusoto.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/04d12a491cd9ddc0833f65a14e392021/15296180472.pdf
    • https://airbays.com/userfiles/file/lojulole.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/popcpga9d0563bnfk2m9j4b2n1/80279087689.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607995c2b2ad0---62757189580.pdf
    • https://lacaune.hu/userfiles/file/rajukizewepupuje.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c4ssihotm9sl63lnm8gkq7v8hr/84593739708.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/3d561fdba3454fe4b85083b485c39f04/topawopekise.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cold+war+season+3+new+zombies+map
    • 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_off0000ee45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 16792 bytes
font_01_sfnt_off00010657.bin
8f3205020d57f148a39967101cc6cd427da8005daef6f1596a91547e34746730
pdf-font-stream PDF embedded font (sfnt) at offset 0x10657 18044 bytes
font_02_sfnt_off00013486.bin
5f6f0c713d2b04a4a43f41da39f773c198055bf51f19071413255b68e626eed3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 10944 bytes