Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ee2261274ec39c…

MALICIOUS

PDF

112.4 KB Created: 2021-07-14 08:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca8e7448a975fb8733bbdb411b780d58 SHA-1: 9a6ace682c520578ea0718f9656bd32f40e610ee SHA-256: b1ee2261274ec39c27280d1ed707e90479597127047bc2aa8fb11ee4021a1452
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of external links and the overall detection profile strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f964acab42725d2cb462a26e3b2ccc47/loxibelakegu.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/65i7c77ni8qce4pcct24qcc331/kulufaxalijiwugalu.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cecd768ffe---bawagizimasezagajokitesi.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa9d25a8c---jerigipoxulafixopu.pdf
    • https://geneticapanama.com/userfiles/file/bafosinekuroloroxalut.pdf
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/22e583c4b4949864a7e8a2f9678b6280/81453249696.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/87606e2f75bf4e3d6f16533b6c5832d5/tavagikuperama.pdf
    • https://aravlicraft.com/cmsCart//upload/file/2657554039.pdf
    • https://alternativecarrepair.com/userfiles/file/55509510990.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/56614833366.pdf
    • http://arunimaflavours.com/userfiles/file/xutanelanavezonixo.pdf
    • https://nasroglobal.com/userfiles/file/27385090181.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc89d1491e---melimifuraparewuvaro.pdf
    • http://praguetransfer.com/files/file/94229821782.pdf
    • https://netiko.ge/img/Data/file/72092378729.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k5s620m8jq3u7ucuiio24de766/xivakazulusufefedofaxiko.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ce9aa4b3---vejezafusemifobetuwusojeb.pdf
    • http://revucue.com/ckfinder/userfiles/files/32707842324.pdf
    • https://susta.vn/userfiles/file/35354095982.pdf
    • http://www.awakohchang.com/image/upload/File/abalagevenaf.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f32a2bee62ec7535ce812b0f1affdc48/gifadoxazigo.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085964169cf9---bavuri.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ttlbp1t9t16sk0mava3e229071/79792170185.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=easy+simple+mehndi+designs+for+front+hands
    • 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_off000157ab.bin
d20768c04abe7a55d4d2448821ae6a321365ae76a83167c5be3110b37ccd121e
pdf-font-stream PDF embedded font (sfnt) at offset 0x157AB 16436 bytes
font_01_sfnt_off0001820e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1820E 16792 bytes
font_02_sfnt_off00019a25.bin
d14364de0c3eb605f9c35411fdac5e83779adad52636ccb0fc499188a0a72740
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A25 11040 bytes