Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba97e2e4d1580c4…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 03:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c70ac9aea93935d62ae8e5a39784bada SHA-1: 774c45c4c60cc231f515442e26a39a3f1298b6ca SHA-256: 0ba97e2e4d1580c4e2b5f517adbca4b03925ef1351a46d3cf34c17b3c3f45d8a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised CMS uploads. The embedded URLs lead to PDFs hosted on various compromised websites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed to redirect users to further 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://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bc63ae7fc---newodotonevexalabokefe.pdf In PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/lafidolefowigosive.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/9f6b098ad335681899b29456fa5eff78/vajovox.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ed3cd3f02---lidaguperokaxadipa.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16222083461705577292.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd27bf40c6d---wejozezizusijuviwamuguxod.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718296ae467---lukawex.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/667b33a92cca1188abd9d6cb3abbe741/65646518013.pdfIn PDF document text
    • http://adveotec.com/img/file/36059976467.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf40e4b427---47772951642.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/55024917935.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ed78cbd6---gawumevozimadigajinezor.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748453ca8c6---66083635241.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/b7ffb0c467e3b0de8cee9800d6d49feb/mamilive.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zulexemigezupakuxusupisu.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a9c74255a---52831244627.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463a101207---wubofeda.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c4f2db3354975924a2c0df794b893ffb/zugimane.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/7414534087.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8662e05386df6072a8b2cb38610fd1de/17732385673.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/47935689699.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1td39nh1jc76ot5r40gk1t02nn/87505043809.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sabugevega.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/funotekusunogivanifo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/en8jg1ai8mr3l792meq69ruum4/goziletedolurira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=examples+of+third+conditional+sentencesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 10968 bytes
SHA-256: 6bc548eceedfca530e8895f876847522cdd599eb96608f7698cf2de10c2cdb03
font_01_sfnt_off0001058c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058C 17612 bytes
SHA-256: b3a385f285894a00479fb10d50ce6026bf0a9fdc8ce84f527fc8bd6c6cf05295
font_02_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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