Malicious PDF — malware analysis report

Static analysis result for SHA-256 156d7c0b5568175a…

MALICIOUS

PDF

86.0 KB Created: 2021-07-06 19:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d45c313c81a97766b01566f0200f6dde SHA-1: 3e437caa9e033c6ed4bb66b3d734abacdba03d4e SHA-256: 156d7c0b5568175a99dadda3c8d0e2b129906915b8ddc55987b1f8ed954788cb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://praward.tw/wp-content/plugins/super-forms/uploads/php/files/0a44c5cc7c21e910d4c8baaa38edc633/vasemukezemugifoxeno.pdf In PDF document text
    • http://beerskiboot.com/img/upload/file/rijabopogejebojute.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c20a62fd30---merivozukonevezuliku.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087130ff389c---52280534382.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c46c9e6---42074882003.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/03a61844060261410561eef377441d84/kajesosavapuseb.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/43393918796.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/sujukajidudoxe.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1b5ac4e4b838b637bc04f4dcfa560daa/dejupejen.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/78095546827.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/digakumuku.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a392f475b7837f365502c41d7e863e19/97918367407.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ffad02b3---24420978514.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a023f80fcf2---24379579811.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fnl166c3bk70est47sk06qo1a1/14601993614.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e214234b75---fabatalarugogukogawamo.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/32303405455.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/26710263558.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/juduliwokaloluvesi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/21813e50b981de0934e4332a4a754fdc/sotuzaxudew.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc411093366---75098456507.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb86d47f100---gukozaviw.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/mibinanemotisi.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/39593431353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=appraisal+comments+for+self+developmentPDF 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_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10828 bytes
SHA-256: ec6c0ab697396560d164f290909f73e7cedd64d1434898a3bcde8bd39d65c62d
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E94 17224 bytes
SHA-256: 28a862e200245746b650b59868caca3250f485413ee5a39913367a9b3f456079