Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a75118bb0741eb6…

MALICIOUS

PDF

97.3 KB Created: 2021-06-29 17:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bb8e894913e10be7fd505e45b31ea5b SHA-1: 031ad2f9035e26462c4d7d60135df7bdd7add55a SHA-256: 1a75118bb0741eb67bc9843aa42ec3332f24434b96280cb067ad2a131f2d336d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farm heuristics and compromised CMS upload links confirms the nature of the attack.

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 https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f06dd0cdb1---73828786947.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15299c90c---webudinujifakotegazakulap.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/9c8f4b9c5a18b4dd1e39059cad9a74d1/19629805434.pdf
    • https://bahispesinde.com/gnc/veri/_files/wemov.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/96e3cfd7613e4c0fa4cb919210fe104f/gagoxebelemevav.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c30f36c22b2---koronilefodinuroputowot.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dad6e28f9---45480410704.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2c64d810---96504480875.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/93a72a2c7cd022c4ccf8f5512a9c78de/34382344948.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e12a5142159d26c168669ba58bce03f4/zopipirof.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160742fe9acc7f---54944697143.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/cc153a644baad85c2a4af19b9bfaea4d/wojabafegafaxodena.pdf
    • https://roc.mn/uploads/files/limuro.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f08d0c34f---15653487317.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/510b5df4997fda125689b0df1810290e/86714189332.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/r75ml49cq004padp6e5cbj2v4b/tetegonasosikifusuluninet.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/kvicmqkvr0os8a20d7u1s0uuqk/488190607.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/2c0d0b0fec8db2c77b9c1dc1454abc7b/zinexukininuliwaxenipek.pdf
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/39279739305.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae1872f9ca---zavepelovuwatases.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4f467e9c4---lajugale.pdf
    • http://hy-concrete.ru/d/files/12830085497.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37a1376ef0---55439465137.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+most+populous+city+in+the+world+is
    • 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_off000113ee.bin
7ab6a98768aa3f8f217ce12a1af3c250f0f3758a9e861c98d52541ff860dd1c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x113EE 10880 bytes
font_01_sfnt_off00012cfa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFA 16792 bytes
font_02_sfnt_off0001450c.bin
df8271166e69063ae3f383bd704716ba19429614b553c3a27ccbc875635ab040
pdf-font-stream PDF embedded font (sfnt) at offset 0x1450C 19088 bytes