Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4119bc08fdaf54…

MALICIOUS

PDF

92.9 KB Created: 2021-08-05 23:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 804b74836de8a99477a4063bcf93e714 SHA-1: 223bddcb13ad10556556607ee7036256f34f3e20 SHA-256: 4f4119bc08fdaf54db8ebd87503878afee6f4649d116e40ad8dc332035c3a856
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4fb3b8fd2cec7f046dbc44d0e10a5405/49424940005.pdf
    • http://alibabashipping.com/userfiles/file/84958331360.pdf
    • http://aurora-c.jp/files/files/dorovegul.pdf
    • http://hondasushi.com/uploads/files/60134755336.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/xexopujolunude.pdf
    • http://tuvanluatdanang.com/upload/ck/files/49829105330.pdf
    • http://analogsys.com/uploaded/file/169972424160924b0f5cc81.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/705ebb973cdd57a9fe1c1e74520b0df7/52180439316.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/13234905327.pdf
    • http://www.herbertvanderbrugghen.nl/draft/devanaforotoxen.pdf
    • https://datawire.gr/files/files/bawipefe.pdf
    • http://wo-kop.pl/userfiles/file/2424297825.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd7a4a0f90844868ac6b4a501def09bc/73670003378.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b8318bfd---toponujedupem.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ba0a53dd0---wewokapilizipewetowa.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/8b9bee67fc4d449ef31c2de9706c9033/80850181346.pdf
    • https://chogmai.org/ckfinder/userfiles/files/zabutigixovuwemi.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/32240p13tjl1scqkpvtd6kaa8p/nurajasavadepadulisa.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2ca4597fc51b888b294e8ba11e4285ca/masaragajugilafejug.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/murufobotimex.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/jf4t1rpfep1fh5miqp4dclpk29/kaliluwuvuxumiridowuwaves.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf78a3ac4d---72010387447.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/78vit3h04p77vt71mvcf9gcko1/45012449279.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a227ffca798---wofidizepuderisev.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac65867c347---9835941384.pdf
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/74111238127.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+charge+an+everstart
    • 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_off0000fb8b.bin
708ad3ff02eaebf83afc7e8a8d40b19b6d1293d8261a7e30038c434013d8104a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 18472 bytes
font_01_sfnt_off00012c7d.bin
cb962005b03f57a4a754de6b08e6651c97ccd3e518a6d798385233559dd9045d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7D 1784 bytes
font_02_sfnt_off000134e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E2 16792 bytes
font_03_sfnt_off00014cf9.bin
672e5c82282684de61fcb811c2e7164d7097f95a91a63f68d638699a357ace22
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF9 10512 bytes