Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aab15d864f9adfd…

MALICIOUS

PDF

87.2 KB Created: 2021-07-04 04:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcefd5f37326c063242dc8c2aabb3736 SHA-1: 3c8fba0a402dadaf412a13b008b8671f61c675b4 SHA-256: 1aab15d864f9adfd630ffa1c8eec93893ca05304873fae0b014a79c9d5e64ba5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8c285625da0ffeaec955c3c59c5fa90e/55413525936.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b25549f2a---43532145230.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d4fec5bc---dopikofan.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cc38e0a11---rozojudemotol.pdf
    • https://bataretak.com/img/files/file/ririxudeviwilus.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/4cad71t5qkoik76b31m00im9et/rilali.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d84986bdb479f57ee137991bb4568b58/65121523081.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/puqfede9asoie3lnolabahngnc/dolepibuzodebizaxusu.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/59519873433420897894b784dc90bcde/borinazegimalivuf.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/lowipexirirejako.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607df42128542---35508193314.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4bce2e33bebe46c62a7a0176fe4a9e97/jezefekunuj.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/846bhkp5fhen3hqib7dc3vpdl0/33992882767.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160991ede40bb2---43104194548.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0m3s5lrm80lg19o8euqpsa5ota/29590517949.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80a101379---gidiposip.pdf
    • http://dmhu.eu/uploads/uplib/file/46957856779.pdf
    • http://berries85.com/clients/4/4c/4c86f126b1006e50d570d35f0f20b0f3/File/59379920183.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/af9f4407bfc3dc28b9fbc28ea9a54bff/kolobos.pdf
    • https://guclupin.com/calisma2/files/uploads/29429357505.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608256c3d6af2---fepidapatemawomutuzogupov.pdf
    • https://abofahed.com/userfiles/file/dagawubizufekijedeni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gre+practice+math+questions+and+answers
    • 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_off0000efc7.bin
1b4f037e1618178c3289d28b2a35e815cfa0efe8a506ca92e1651d9d7d537643
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 17680 bytes
font_01_sfnt_off00011e16.bin
06db94bc67ef49f44b004b80360e53d1d7c80d821a56f1f20f133ad0cc59fbf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E16 11104 bytes
font_02_sfnt_off000137af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137AF 16792 bytes