Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e18907e979f882…

MALICIOUS

PDF

92.2 KB Created: 2021-06-28 18:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b4ca6948a7acf38103478ac23d28250 SHA-1: 59e70831744bb32706d1ea6a7ac37165236f1238 SHA-256: 34e18907e979f882a5b735bdbe51595db948f36b54cc4c05b46f5a7d85e19b13
96 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27960ca0d---padew.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/6sgdl5hbhbd5jam1nrpacfe5fr/8290897226.pdf
    • http://lamgi.pl/ckfinder/userfiles/files/21142426478.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sufef.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084142f11504---supugipino.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f04a82084c---nirekifu.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56a4d0a6db---bovedojod.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ijbe0dp1onre3q9ro86aalhev3/34580898232.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//85629343674.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f69eb6rv22t8oreriljebek950/jimeximosu.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/876b652928279ed5ee0f7cac568b72ff/dagimotoba.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/aki8dbl8f0hp9s9gua6akgi29ive5kr4/25791456209.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ce708150110988fccfac548c7dd6c230/96774738539.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735bdf374da---75966022894.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/abfa31f6683337574fbbc515cd7199e6/bujesogodumeput.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160984b686179d---9427479865.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfbc3c7a55---xigavovazumare.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/30e1e2cd3ff283f2c0afb28885ac20be/xukabogologo.pdf
    • https://ludifrance.fr/userfiles/file/14121541562.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/25746541384.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bd4b633cef4f18b09ce18c48d48ab0a9/sizifewoduvazopasaf.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06bd12e08---tojesavigemu.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7ptr9q0o52qm40pcmoubmv6s8c/xibune.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaddc42c5f---zogirabuwezugiveguzid.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e52c8a5982---49769183980.pdf
    • https://cmsschoolkg.org/userfiles/file/69982248526.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=action+movies+dubbed+in+tamil
    • 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_off00010724.bin
2712193d5674c886f9c0d45e977c17b16d4ca3a333437c79595d351c7dcb8372		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 16348 bytes
font_01_sfnt_off00013104.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13104 16792 bytes
font_02_sfnt_off0001491b.bin
eaef99d496154df0f70e0ee41958f9fc12adb7a9f029b926bd49fe97f43d553c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 10716 bytes

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