Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e82c73ef63bfe07…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 04:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 70d4ea2ba92c80887cbbb52c72fd0ed7 SHA-1: 0b72aa8be682ff13b2c8d1e2869be446852667b2 SHA-256: 1e82c73ef63bfe07a6d4915e53ab481320c42517a82ed3402ecfeadb119c9567
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://andlupa.com/userfiles/file/raxelitaxakewajogipi.pdf
    • https://retake.dk/ckfinder/userfiles/files/5497399719.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef3babf92---rowipalojenabo.pdf
    • http://bagiez.de/userfiles/file/vukiwoxelixujibukeseza.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b18b28b6f---rapuvi.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/7me2qi1jfdqfdg1gmiv9dc0il1/fuxujadibiwinudamaxowix.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/24744999880.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766f20ecb17---98599499488.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/webigisit.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c842b95cbb---wijudafikevowetitanas.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608c40352dacd---80886808167.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/1q51mp5uu4pmp18ua6tugpsj9v/16809802354.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2b86eaa0---kemagojibolaretiro.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/1qslcd11714repi0jas015059d/pupelixijofusunupe.pdf
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/badiwabezedemafupavosenun.pdf
    • https://allmassage.net/upload/file/20210505010235.pdf
    • https://hospvetcentral.pt/site/upload/file/bipotuzedovajupakuseta.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2684946eeb---guluwexasolevobajikemeg.pdf
    • http://autoscuolauniversale.it/userfiles/files/78122911453.pdf
    • http://mimarkamilozkartal.com/userfiles/files/85180028038.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075db07c0a41---rifanefajazorukig.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c4a42e5cc5120d28cc106316af8cc62f/5596627574.pdf
    • https://nestaerospace.com/uploads/file/fevobuludixitulan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=a+brief+history+of+language+teaching
    • 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_off00010db8.bin
8c03679232bb637ffb2786f4bdfe787b5c4d64afa9fbd16acbbe8bfd54256116
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 10948 bytes
font_01_sfnt_off00012728.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 16792 bytes
font_02_sfnt_off00013f3a.bin
84d33a0e7f0b65a9d1e9ee8787a778404fec1588277b7d8a43d7a9d6d1af07ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3A 17264 bytes