Malicious PDF — malware analysis report

Static analysis result for SHA-256 c088d7a52a981eb7…

MALICIOUS

PDF

98.8 KB Created: 2021-06-20 12:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0f0d6cbec20b79002491f3c24a59a11c SHA-1: 17b24463310adde4e4c31d475d79c8de4cd1e2c5 SHA-256: c088d7a52a981eb74f897bc245712b3ae139da301142e4d7ab1bdbd9ebaab65b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malware or phishing content. The presence of a URL with 'utm_term=avengers+beta+apk+download' implies a lure for users seeking specific software, likely a trojanized application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9jf3np6lrnirkgvf4oe0ht1rm5/39386486337.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/go3gtsirus541tlcvbmhsgtoov/1752835845.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a016eb92707---suleluvozipujuwolato.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a47957928---34305728579.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/111ebee4b965505f08b85ca9f227de59/jewifukixozulewimavebup.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/d8482a3b240bc76da2d3a06db28bf3e5/zutotugimujadixesotuga.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16705b9b0---2266410415.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/22572646189.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/96872759976.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ht57nsfkj65rvle2iobb0sh7ih/jirosow.pdfIn PDF document text
    • http://imaginove.eu/data/Files/bibasokasovumu.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/39919974441.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f1770630---25390344434.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608444b6e5146---kifamusu.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/e2ebdb9bd1a3c516d670bc8d554cfb69/kulimufifuzedanewu.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/70637688646.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c203571b5cc---furatavodomumetakufuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=avengers+beta+apk+downloadPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10996 3224 bytes
SHA-256: ef8da90bbb2dce9c20605a6202cfec549b1d53b563f940cdef7de75af68c067d
font_01_sfnt_off00011500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11500 5212 bytes
SHA-256: 79537d4447c6351ee0aabd82e32fe330bc801bc62cfc35af33bbf7e0fd351aa8
font_02_sfnt_off000126cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CB 2960 bytes
SHA-256: 0d0f0f145717943b9bfab8c5240bb6edb8d5a5cf9b475157875bf442c232514e
font_03_sfnt_off000132c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C2 10832 bytes
SHA-256: b8b1037bed2d0d06d8562e5588dc26887d725b3363f27f018024b8c68a76fd89
font_04_sfnt_off000157a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A8 16740 bytes
SHA-256: da6ee8ca26148750088f3b1db7ef27e0584a4b14d65706f43587f240241f0765
font_05_sfnt_off00016e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E43 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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