Malicious PDF — malware analysis report

Static analysis result for SHA-256 a63125b4e1420084…

MALICIOUS

PDF

92.8 KB Created: 2021-07-01 23:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e4141c1c9fbc23dc0601ab655c9c98b SHA-1: 52ae8efed2c16a631f200181ed9f1d04a43a375d SHA-256: a63125b4e1420084a09ce734c5e103fd83651852129fd14ba7e0c5ca1f74f4f5
96 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 domains, indicating a link farm or SEO spamming operation. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of multiple external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://chcial.ru/uplcv?utm_term=account+question+answer
    • http://pphu-joanna.pl/fckpliki/file/tadajesopijuw.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/57e0d951fffb8603ae14e46867dcf609/xumuse.pdf
    • http://eksan-ltd.com/userfiles/file/zomugesifenufudipabusarox.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5b147b0872c0cec46483e9f493e38f64/35299667347.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/k5ifdip1s992g7a74njl2rr6bm/49696525174.pdf
    • http://nuraski.pl/wsg/userfiles/toragubuwugaj.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781d4c0361b---84513685756.pdf
    • http://hyderabadibiryanicorner.com/admin/images/file/fezukosarotisopo.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1063b0f332ab5ef3ca8ee720168b4ad8/pirabafozad.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/00616d9efa5c9a2975e7a9885dc80eeb/lanedemafadozamegaretobij.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/a15074f586dbe1a1d82f22ee20106158/rugimilade.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5e7383ae---tenosiguzevibusinulala.pdf
    • http://erbaytag.com/resimler/files/vijugifa.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3fbccf0a1---litivez.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfce3d732d---vidowugojomuxevoxaf.pdf
    • http://rustproofingottawa.com/userfiles/file/pagakebokazukanuxogizipad.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/70d1a461f5ec782914becf57955e07b9/83942147893.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7f79afd14589040b929235c9e65317c0/71733251283.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/ji4v16gb8pc3ng66cnd87vt5so/36979972532.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af1fb5dbac---firijevixevudamubanil.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3c235a06---61638109064.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f2b6bfd1d---katapapa.pdf
    • http://allasclub.com/campannas/file/xemixu.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/249c6ec07c8b09d518ff8111b445f94f/96704241105.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0f0f0b8c---44377517317.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f16b.bin
f08696e15d1bdc45d5460b2d6c6cbebe6912d32f5b487d67f0db9e6c011ba3f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16B 17656 bytes
font_01_sfnt_off00011f39.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F39 16312 bytes
font_02_sfnt_off00013544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 16792 bytes
font_03_sfnt_off00014d5b.bin
c28969961d550684ed4c3b163e015847c2653656578c406099478afa6db8e4dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D5B 10488 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.