Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d444dcc885f6fd…

MALICIOUS

PDF

84.4 KB Created: 2021-08-22 04:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20f5ce4cd5f47e66f8681629637c5968 SHA-1: 34288d9458485aa93b8776e2b18ab39313442e70 SHA-256: 57d444dcc885f6fd5384ff795fbfb80705c9ebbcb68968304e4c2563b4d1d31b
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised or disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bodzlomu.com/userfiles/file/fesimuxaxenuxuzajo.pdf
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/rorezepobaxopedozolifixa.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/o6ialduc9m6kou7kg83gp07536/fasezusudevefuf.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/e08a883d44a67dc6bdc1b2b9fe4c0216/54780698061.pdf
    • http://andrelandberg.com/userfiles/file/fanilesez.pdf
    • https://tatsolarlight.com/uploads/files/12440091661.pdf
    • http://pratiklinik.com/img/userfiles/files/jurediborajizawuvininu.pdf
    • https://angkortaxiservice.com/userfiles/file/81069049282.pdf
    • https://harkakotony.hu/UserFiles/file/mimadeviwaped.pdf
    • http://donghozibistore.com/luutru/files/82668027710.pdf
    • http://brandnewgoods.net/userfiles/file/93622755396.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe3121c21---64559125596.pdf
    • http://tuttotop.com/userfiles/files/zubija.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/66962923963.pdf
    • http://kunjipsc.com/uploads/files/zatafovakipozixikik.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719a25ba37f---46704589565.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7e05575a3---lajenamimiranez.pdf
    • http://bradzo-ep.com/uploads/files/fubifexoxopifesegiwevaga.pdf
    • https://lapalettedesarts.fr/gestion/file/94650100363.pdf
    • http://makesomenoise.hu/upload/file/vekilomafom.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/0b01b5b0667314a74621c7e8db9f7e05/79025661946.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/907644218d1ef505aeb69f604713987d/66068575084.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4ffaa6bb---50678268625.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=potassium+hydroxide+msds+pubchem
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d067cdef2aa3c297e63867d4cf3a65da/wibevoguxekifujutor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e53b.bin
d792c06907c14b2c937eff663f7104ee3535ac06cf4650ae0a9ef3878068adb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 17064 bytes
font_01_sfnt_off00011145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 16792 bytes
font_02_sfnt_off0001295c.bin
8cd159ca0bf49ae5372854b760413ce4716051e2157a5d2dd5e765a84d130cf7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 11084 bytes