Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd722a3056e6939f…

MALICIOUS

PDF

81.9 KB Created: 2021-07-01 14:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6df54e6740a0ecb804a913f2481077e8 SHA-1: 5472d175d268696bd972ecc4559c293394eab4dd SHA-256: bd722a3056e6939ff6c47362dd98f1ee09377d6a34000ac15a4dae092457b8e9
96 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute further malicious content or redirect users to phishing sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://droprint.my/home/ququ4923/public_html/userfiles/file/vorojoxerukunib.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/18755072590.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/46e935489357d72b8f70e5f7dbbd05df/62075763798.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd6c41e897---piraxamufag.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e209ed77c---gulezotodifafagugugax.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608aca27d7b09---92502781807.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1229e5a57---bowiwamexuvejitu.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096519d27233---lupigatulijiparuvunikinop.pdf
    • https://daxitrip.com/basefile/daxitripcom/files/68181960721.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160942ae6264aa---bofutaduz.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a2skppd3nh0b5r34af01n7g8uv/2742034212.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8a31c301---fopiporelanidudiledox.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833cd652eed---5795967975.pdf
    • http://bestbuyfromindia.com/userfiles/file/91011708328.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/67b2216209fb033aacbb391f1bae9817/38671009659.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/25q4slderkls1tbuhipqe05kk5/jetesejitujituxoxa.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b3e54503a2300878d2f29fc278ab5db1/15149700957.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/no4tkq5155gsvt93oeasqg96t1/55222937686.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8713e5596f---nomisexilozojixudozin.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/b6a4e38679cecf1f41b69633d1c7a5ec/4157499479.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6d7ca17ce4380139569c6e929c5c8c66/32397527250.pdf
    • http://agcslohian.com/userfiles/file/68201905629.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/75b14166e7ad56094c723317adad4f48/jofigo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=intrapersonal+communication+definition+and+examples
    • 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_off0000db61.bin
891fd5855680c2aaca61d35e69be1d22b8f67446e5c305e9017696bd52ed7265		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10932 bytes
font_01_sfnt_off0000f4ad.bin
6ae9cec31d5d8812cfc5dea256985017875baeca2861970710903db1c00fb4a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AD 16768 bytes
font_02_sfnt_off00011fdf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FDF 16792 bytes

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