Malicious PDF — malware analysis report

Static analysis result for SHA-256 15648f6b91fce2ae…

MALICIOUS

PDF

89.6 KB Created: 2021-07-18 20:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0780073b4e39729e3123e89395c5e58b SHA-1: 5e812e7103632bb86ccd824bccf6ce44b8b5aaf4 SHA-256: 15648f6b91fce2ae19acd434827ff265ff0571ebd4f60f781dbe1af413cde289
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites host PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, and the document body was unreadable, but the presence of numerous malicious links is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/761bbd78f4ec64a965e4ab689f71962b/72661638526.pdf In PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6ckodg68b2argnb3o5qj4u9agf84g0qe/xaxujipoxapibipuj.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39cd3608d9fedbdb923ea86b313f144b/65127889490.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/29b5234d49d49425ec514d2a2d26a424/rixug.pdfIn PDF document text
    • https://brakos.it/file/23492734337.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/m8onokkqh0u8qpvsoo58cac0sh/lexupok.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/4bp5776682qmek613t4tc4f3oi/lexozuziganon.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/163321890c759d4d2df22a0722607c6a/72089679557.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/1982650866.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/xaxabuwi.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/gogiwiko.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/wetubasisosa.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/63c356b6161f5fceecbbbe2d7f40eea6/wafagimajabufifujadawe.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28390e750f---xajukapobuj.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079488c7333a---zinibijalusutedol.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160966b8b6b1a6---51154785408.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/47510104546.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca911606b6---59709492021.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/68562998347.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74397e387d---37195584114.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3213d5855d---14717982266.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/32i4vii6qtednrsfdc7ragukdh/vixuguxopi.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/74538451758.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/7741280634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=data+structure+a+pseudocode+approach+with+cPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD773 16592 bytes
SHA-256: fa1c929fa642cfcf0b0f43639b68849163276d5ac12b3a2745509c9e16db8afd
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 17600 bytes
SHA-256: 4e89f6735b62e71b09eb7363414b64e28884e96b67db5630388db02e95c08c81
font_02_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_03_sfnt_off000124d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEC 10648 bytes
SHA-256: af5beb07abbb8e4a63a7bc2e90900c635f14a9820d33f1ce313e5bb6b6c6de51

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