Malicious PDF — malware analysis report

Static analysis result for SHA-256 31868f96f9403dcf…

MALICIOUS

PDF

91.2 KB Created: 2021-08-12 10:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 187b4c17f3fa35121146168c071c8171 SHA-1: 8f69ecf65d6c08301fec5a19627429a851be9f34 SHA-256: 31868f96f9403dcfec668adcdb4afd1703527823dfdc44c8bf2c7e849345fda7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the link farm pattern suggests an attempt to drive traffic to malicious sites, possibly for phishing or SEO poisoning. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6r7j00vc4tigqquanjplpfh9p/88007617788.pdf In PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/gekukadizifiw.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b384ef49---20722918632.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/300ad1et389l0anu36e8264ire/genud.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/getukalewupifanid.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/terilagorofixibelebode.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/49055184849.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4803378364a667763221b0fbe2f7ab26/bagajapof.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/53pkd17ctcdt1vkp2lg32fdvo1/fefusumumojotetotosam.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/bogegosivurogowideber.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dab5ed573---pitataroxetivapavebuti.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/274c3499774d3df2f85cdddc7133686d/jubesepimujagozis.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160836bc8af005---4400547617.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecfdfb81a7---99507950306.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/pujirolubiwariwapilo.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/3la5m4gglu5fljqr0g61o7mu0j/kasikikinawibuzusob.pdfIn PDF document text
    • http://myqself.com/upload/files/duzakatalivoridepi.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/62681304608.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/nekowuges.pdfIn PDF document text
    • https://dacola.com/upload/files/76238993808.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/39696279682.pdfIn PDF document text
    • http://orlickachata.cz/files/files/26760629846.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0b3ee3908---rutavetinuzekiwetaxitata.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41235a613e---95462874549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+easily+get+silver+coins+in+geometry+dashPDF link annotation
    • 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_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 19496 bytes
SHA-256: 97fa36506356050efc4da69c8fba9608ccf1df60db0338027513c65dfd5d28c8
font_01_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DB 11076 bytes
SHA-256: 097b7d3a6c98830c0c1017d380cfbf49c5bcb1e614ca4264bb611023fb21c3cc

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