Malicious PDF — malware analysis report

Static analysis result for SHA-256 373d82b216614ad0…

MALICIOUS

PDF

82.7 KB Created: 2021-07-26 00:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4dd2d158566fe81f8dac6e222894ecff SHA-1: 62974e9c2afbaa7fb79edf7c7c1221971f4a2c09 SHA-256: 373d82b216614ad08f13a8fcaaa32d55285e49af192938c1c15cd00f3a188db7
116 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and IP addresses, indicating a likely attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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 http://ligneus.hu/upload/file/92107134784.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623d0cc3f3---29287547957.pdfPDF link annotation
    • http://nfc.soo.jp/file/53509658659.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/rb4hhdgig8nfj6b2sno3tkhp62/zorujevejagudinezurur.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210717_1180EF666B5E9750.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d78e66c0449---58849247799.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/e5f82c5debbbeb6772154653e66748b5/46276461169.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0eb622bf35---loridulukozabone.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4eb1d90c64eabe010540ba0db44db7dc/lulutubabulesoxatoziled.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/lozigagulaboxovogipal.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/sefotuzekadopevekikemose.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/388d9a77165604ab8a90fb78c3fbf524/11526875740.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cf8a4f95---mabinabulejaru.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210724_0FC19838BD51AE45.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/motomujulimezoduwigawexon.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/a86a6c96e0c415a17b636d947fda3423/patinutebukojig.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609deab52743a---xaribujelumipagisu.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/12653553158.pdfIn PDF document text
    • https://grouptm2.com/contents//files/lumukokixiwawuwitametuke.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/gowexewazinatajofix.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/kanusebotapevejejenube.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d86de5349c6---45469076713.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160826526ca395---degatulazo.pdfIn PDF document text
    • https://papiratisk.cz/soubory/jabitupax.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ac235c0d197f0e46b4dd28d94a4541c3/2426038699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+buy+san+antonio+1604PDF 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_off0000dcdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F6 10780 bytes
SHA-256: 2c8e726240ca46baa76a86bfde8f47c546ff64be443eba992f68b241f58bd58a
font_02_sfnt_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17916 bytes
SHA-256: e7b24e1d20ea001c6fd15875a40aac8bd3f2254825d8d761a13149737d577cba

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